{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-27477", "tracking": { "current_release_date": "2026-03-23T02:57:20.432592Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-27477", "initial_release_date": "2026-02-24T20:04:21.082898Z", "revision_history": [ { "date": "2026-02-24T20:04:21.082898Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (2).| References created (2).| CWES updated (1)." }, { "date": "2026-02-24T20:04:34.831227Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-02-24T21:30:07.364536Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-02-24T21:30:17.068855Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-02-25T11:03:00.402827Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (21).| References created (4).| CWES updated (1)." }, { "date": "2026-02-25T15:13:57.469079Z", "number": "6", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-02-26T21:13:51.383473Z", "number": "7", "summary": "Unknown change." }, { "date": "2026-02-26T21:13:56.503085Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-02-26T21:26:12.667028Z", "number": "9", "summary": "CVSS created.| Products connected (2).| Product Identifiers created (2)." }, { "date": "2026-02-26T21:26:17.128290Z", "number": "10", "summary": "NCSC Score updated." }, { "date": "2026-02-28T20:04:52.839389Z", "number": "11", "summary": "Products connected (196).| Products removed (21)." }, { "date": "2026-03-01T10:36:50.018138Z", "number": "12", "summary": "Products connected (21).| Products removed (175)." }, { "date": "2026-03-01T12:11:15.718647Z", "number": "13", "summary": "Products connected (175).| Products removed (21)." }, { "date": "2026-03-02T12:07:16.176403Z", "number": "14", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (2).| References created (3)." }, { "date": "2026-03-02T12:07:17.884650Z", "number": "15", "summary": "NCSC Score updated." }, { "date": "2026-03-03T14:26:47.187365Z", "number": "16", "summary": "Products connected (21).| Products removed (175)." }, { "date": "2026-03-20T09:40:57.112364Z", "number": "17", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T09:40:59.484490Z", "number": "18", "summary": "NCSC Score updated." } ], "status": "interim", "version": "18" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=4.4.0|<4.4.14", "product": { "name": "vers:unknown/>=4.4.0|<4.4.14", "product_id": "CSAFPID-5753154" } }, { "category": "product_version_range", "name": "vers:unknown/>=4.5.0|<4.5.7", "product": { "name": "vers:unknown/>=4.5.0|<4.5.7", "product_id": "CSAFPID-5753155" } } ], "category": "product_name", "name": "mastodon" } ], "category": "vendor", "name": "Bitnami" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=4.4.0|<4.4.14", "product": { "name": "vers:unknown/>=4.4.0|<4.4.14", "product_id": "CSAFPID-5731143", "product_identification_helper": { "cpe": "cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/>=4.5.0|<4.5.7", "product": { "name": "vers:unknown/>=4.5.0|<4.5.7", "product_id": "CSAFPID-5731144", "product_identification_helper": { "cpe": "cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "mastodon" } ], "category": "vendor", "name": "joinmastodon" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=4.4.0|<4.4.14", "product": { "name": "vers:unknown/>=4.4.0|<4.4.14", "product_id": "CSAFPID-5695281" } }, { "category": "product_version_range", "name": "vers:unknown/>=4.5.0|<4.5.7", "product": { "name": "vers:unknown/>=4.5.0|<4.5.7", "product_id": "CSAFPID-5695282" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.0", "product": { "name": "vers:unknown/v4.4.0", "product_id": "CSAFPID-3747999" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.1", "product": { "name": "vers:unknown/v4.4.1", "product_id": "CSAFPID-3748003" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.10", "product": { "name": "vers:unknown/v4.4.10", "product_id": "CSAFPID-5362030" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.11", "product": { "name": "vers:unknown/v4.4.11", "product_id": "CSAFPID-5455395" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.12", "product": { "name": "vers:unknown/v4.4.12", "product_id": "CSAFPID-5550555" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.13", "product": { "name": "vers:unknown/v4.4.13", "product_id": "CSAFPID-5700276" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.2", "product": { "name": "vers:unknown/v4.4.2", "product_id": "CSAFPID-3748004" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.3", "product": { "name": "vers:unknown/v4.4.3", "product_id": "CSAFPID-5100265" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.4", "product": { "name": "vers:unknown/v4.4.4", "product_id": "CSAFPID-5100266" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.5", "product": { "name": "vers:unknown/v4.4.5", "product_id": "CSAFPID-5100267" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.6", "product": { "name": "vers:unknown/v4.4.6", "product_id": "CSAFPID-5129478" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.7", "product": { "name": "vers:unknown/v4.4.7", "product_id": "CSAFPID-5129479" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.8", "product": { "name": "vers:unknown/v4.4.8", "product_id": "CSAFPID-5247549" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.9", "product": { "name": "vers:unknown/v4.4.9", "product_id": "CSAFPID-5247550" } }, { "category": "product_version_range", "name": "vers:unknown/v4.5.0", "product": { "name": "vers:unknown/v4.5.0", "product_id": "CSAFPID-5362031" } }, { "category": "product_version_range", "name": "vers:unknown/v4.5.1", "product": { "name": "vers:unknown/v4.5.1", "product_id": "CSAFPID-5362036" } }, { "category": "product_version_range", "name": "vers:unknown/v4.5.2", "product": { "name": "vers:unknown/v4.5.2", "product_id": "CSAFPID-5362037" } }, { "category": "product_version_range", "name": "vers:unknown/v4.5.3", "product": { "name": "vers:unknown/v4.5.3", "product_id": "CSAFPID-5362038" } }, { "category": "product_version_range", "name": "vers:unknown/v4.5.4", "product": { "name": "vers:unknown/v4.5.4", "product_id": "CSAFPID-5455396" } }, { "category": "product_version_range", "name": "vers:unknown/v4.5.5", "product": { "name": "vers:unknown/v4.5.5", "product_id": "CSAFPID-5550556" } }, { "category": "product_version_range", "name": "vers:unknown/v4.5.6", "product": { "name": "vers:unknown/v4.5.6", "product_id": "CSAFPID-5700277" } } ], "category": "product_name", "name": "mastodon" } ], "category": "vendor", "name": "mastodon" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/v4.4.0", "product": { "name": "vers:unknown/v4.4.0", "product_id": "CSAFPID-3748005" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.1", "product": { "name": "vers:unknown/v4.4.1", "product_id": "CSAFPID-3748009" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.10", "product": { "name": "vers:unknown/v4.4.10", "product_id": "CSAFPID-5521245" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.11", "product": { "name": "vers:unknown/v4.4.11", "product_id": "CSAFPID-5521246" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.12", "product": { "name": "vers:unknown/v4.4.12", "product_id": "CSAFPID-5668201" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.13", "product": { "name": "vers:unknown/v4.4.13", "product_id": "CSAFPID-5751232" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.2", "product": { "name": "vers:unknown/v4.4.2", "product_id": "CSAFPID-3748010" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.3", "product": { "name": "vers:unknown/v4.4.3", "product_id": "CSAFPID-5266547" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.4", "product": { "name": "vers:unknown/v4.4.4", "product_id": "CSAFPID-5266548" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.5", "product": { "name": "vers:unknown/v4.4.5", "product_id": "CSAFPID-5266549" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.6", "product": { "name": "vers:unknown/v4.4.6", "product_id": "CSAFPID-5266550" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.7", "product": { "name": "vers:unknown/v4.4.7", "product_id": "CSAFPID-5266551" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.8", "product": { "name": "vers:unknown/v4.4.8", "product_id": "CSAFPID-5521247" } }, { "category": "product_version_range", "name": "vers:unknown/v4.4.9", "product": { "name": "vers:unknown/v4.4.9", "product_id": "CSAFPID-5521248" } }, { "category": "product_version_range", "name": "vers:unknown/v4.5.0", "product": { "name": "vers:unknown/v4.5.0", "product_id": "CSAFPID-5536392" } }, { "category": "product_version_range", "name": "vers:unknown/v4.5.1", "product": { "name": "vers:unknown/v4.5.1", "product_id": "CSAFPID-5536393" } }, { "category": "product_version_range", "name": "vers:unknown/v4.5.2", "product": { "name": "vers:unknown/v4.5.2", "product_id": "CSAFPID-5536394" } }, { "category": "product_version_range", "name": "vers:unknown/v4.5.3", "product": { "name": "vers:unknown/v4.5.3", "product_id": "CSAFPID-5536395" } }, { "category": "product_version_range", "name": "vers:unknown/v4.5.4", "product": { "name": "vers:unknown/v4.5.4", "product_id": "CSAFPID-5544290" } }, { "category": "product_version_range", "name": "vers:unknown/v4.5.5", "product": { "name": "vers:unknown/v4.5.5", "product_id": "CSAFPID-5668202" } }, { "category": "product_version_range", "name": "vers:unknown/v4.5.6", "product": { "name": "vers:unknown/v4.5.6", "product_id": "CSAFPID-5751233" } } ], "category": "product_name", "name": "mastodon" } ], "category": "vendor", "name": "tootsuite" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-27477", "cwe": { "id": "CWE-918", "name": "Server-Side Request Forgery (SSRF)" }, "notes": [ { "category": "description", "text": "Mastodon is a free, open-source social network server based on ActivityPub. FASP registration requires manual approval by an administrator. In versions 4.4.0 through 4.4.13 and 4.5.0 through 4.5.6, an unauthenticated attacker can register a FASP with an attacker-chosen `base_url` that includes or resolves to a local / internal address, leading to the Mastodon server making requests to that address. This only affects Mastodon servers that have opted in to testing the experimental FASP feature by setting the environment variable `EXPERIMENTAL_FEATURES` to a value including `fasp`. An attacker can force the Mastodon server to make http(s) requests to internal systems. While they cannot control the full URL that is being requested (only the prefix) and cannot see the result of those requests, vulnerabilities or other undesired behavior could be triggered in those systems. The fix is included in the 4.4.14 and 4.5.7 releases. Admins that are actively testing the experimental \"fasp\" feature should update their systems. Servers not using the experimental feature flag `fasp` are not affected.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-27477" }, { "category": "description", "text": "Mastodon is a free, open-source social network server based on ActivityPub. FASP registration requires manual approval by an administrator. In versions 4.4.0 through 4.4.13 and 4.5.0 through 4.5.6, an unauthenticated attacker can register a FASP with an attacker-chosen `base_url` that includes or resolves to a local / internal address, leading to the Mastodon server making requests to that address. This only affects Mastodon servers that have opted in to testing the experimental FASP feature by setting the environment variable `EXPERIMENTAL_FEATURES` to a value including `fasp`. An attacker can force the Mastodon server to make http(s) requests to internal systems. While they cannot control the full URL that is being requested (only the prefix) and cannot see the result of those requests, vulnerabilities or other undesired behavior could be triggered in those systems. The fix is included in the 4.4.14 and 4.5.7 releases. Admins that are actively testing the experimental \"fasp\" feature should update their systems. Servers not using the experimental feature flag `fasp` are not affected.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-27477" }, { "category": "description", "text": "Mastodon is a free, open-source social network server based on ActivityPub. FASP registration requires manual approval by an administrator. In versions 4.4.0 through 4.4.13 and 4.5.0 through 4.5.6, an unauthenticated attacker can register a FASP with an attacker-chosen `base_url` that includes or resolves to a local / internal address, leading to the Mastodon server making requests to that address. This only affects Mastodon servers that have opted in to testing the experimental FASP feature by setting the environment variable `EXPERIMENTAL_FEATURES` to a value including `fasp`. An attacker can force the Mastodon server to make http(s) requests to internal systems. While they cannot control the full URL that is being requested (only the prefix) and cannot see the result of those requests, vulnerabilities or other undesired behavior could be triggered in those systems. The fix is included in the 4.4.14 and 4.5.7 releases. Admins that are actively testing the experimental \"fasp\" feature should update their systems. Servers not using the experimental feature flag `fasp` are not affected.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/GIT%2FCVE-2026-27477.json?alt=media" }, { "category": "description", "text": "Mastodon is a free, open-source social network server based on ActivityPub. FASP registration requires manual approval by an administrator. In versions 4.4.0 through 4.4.13 and 4.5.0 through 4.5.6, an unauthenticated attacker can register a FASP with an attacker-chosen `base_url` that includes or resolves to a local / internal address, leading to the Mastodon server making requests to that address. This only affects Mastodon servers that have opted in to testing the experimental FASP feature by setting the environment variable `EXPERIMENTAL_FEATURES` to a value including `fasp`. An attacker can force the Mastodon server to make http(s) requests to internal systems. While they cannot control the full URL that is being requested (only the prefix) and cannot see the result of those requests, vulnerabilities or other undesired behavior could be triggered in those systems. The fix is included in the 4.4.14 and 4.5.7 releases. Admins that are actively testing the experimental \"fasp\" feature should update their systems. Servers not using the experimental feature flag `fasp` are not affected.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Bitnami%2FBIT-mastodon-2026-27477.json?alt=media" }, { "category": "other", "text": "0.00048", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U", "title": "CVSSV4" }, { "category": "other", "text": "4.6", "title": "CVSSV4 base score" }, { "category": "other", "text": "4.0", "title": "NCSC Score" }, { "category": "other", "text": "The value of the most recent CVSS (V3) score, Is related to (a version of) an uncommon product, Is related to an uncommon product vendor", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5695281", "CSAFPID-5695282", "CSAFPID-5731143", "CSAFPID-5731144", "CSAFPID-3748005", "CSAFPID-3748009", "CSAFPID-3748010", "CSAFPID-5266547", "CSAFPID-5266548", "CSAFPID-5266549", "CSAFPID-5266550", "CSAFPID-5266551", "CSAFPID-5521245", "CSAFPID-5521246", "CSAFPID-5521247", "CSAFPID-5521248", "CSAFPID-5536392", "CSAFPID-5536393", "CSAFPID-5536394", "CSAFPID-5536395", "CSAFPID-5544290", "CSAFPID-5668201", "CSAFPID-5668202", "CSAFPID-5751232", "CSAFPID-5751233", "CSAFPID-5753154", "CSAFPID-5753155", "CSAFPID-3747999", "CSAFPID-3748003", "CSAFPID-3748004", "CSAFPID-5100265", "CSAFPID-5100266", "CSAFPID-5100267", "CSAFPID-5129478", "CSAFPID-5129479", "CSAFPID-5247549", "CSAFPID-5247550", "CSAFPID-5362030", "CSAFPID-5362031", "CSAFPID-5362036", "CSAFPID-5362037", "CSAFPID-5362038", "CSAFPID-5455395", "CSAFPID-5455396", "CSAFPID-5550555", "CSAFPID-5550556", "CSAFPID-5700276", "CSAFPID-5700277" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-27477" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/27xxx/CVE-2026-27477.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27477" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-27477" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/GIT%2FCVE-2026-27477.json?alt=media" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-27477" }, { "category": "external", "summary": "Source raw - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Bitnami%2FBIT-mastodon-2026-27477.json?alt=media" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; osv", "url": "https://github.com/mastodon/mastodon/security/advisories/GHSA-46w6-g98f-wxqm" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; osv", "url": "https://github.com/mastodon/mastodon/commit/7b85d2182361e68d51d9a02f94fb1070b5f503b1" }, { "category": "external", "summary": "Reference - osv", "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27477.json" }, { "category": "external", "summary": "Reference - osv", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27477" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "baseScore": 5.9, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-3747999", "CSAFPID-3748003", "CSAFPID-3748004", "CSAFPID-3748005", "CSAFPID-3748009", "CSAFPID-3748010", "CSAFPID-5100265", "CSAFPID-5100266", "CSAFPID-5100267", "CSAFPID-5129478", "CSAFPID-5129479", "CSAFPID-5247549", "CSAFPID-5247550", "CSAFPID-5266547", "CSAFPID-5266548", "CSAFPID-5266549", "CSAFPID-5266550", "CSAFPID-5266551", "CSAFPID-5362030", "CSAFPID-5362031", "CSAFPID-5362036", "CSAFPID-5362037", "CSAFPID-5362038", "CSAFPID-5455395", "CSAFPID-5455396", "CSAFPID-5521245", "CSAFPID-5521246", "CSAFPID-5521247", "CSAFPID-5521248", "CSAFPID-5536392", "CSAFPID-5536393", "CSAFPID-5536394", "CSAFPID-5536395", "CSAFPID-5544290", "CSAFPID-5550555", "CSAFPID-5550556", "CSAFPID-5668201", "CSAFPID-5668202", "CSAFPID-5695281", "CSAFPID-5695282", "CSAFPID-5700276", "CSAFPID-5700277", "CSAFPID-5731143", "CSAFPID-5731144", "CSAFPID-5751232", "CSAFPID-5751233", "CSAFPID-5753154", "CSAFPID-5753155" ] } ], "title": "CVE-2026-27477" } ] }