{ "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-2026-34531", "tracking": { "current_release_date": "2026-04-02T21:25:21.216249Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-34531", "initial_release_date": "2026-04-01T01:03:21.406801Z", "revision_history": [ { "date": "2026-04-01T01:03:21.406801Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-04-01T01:03:27.174292Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-04-01T21:38:50.349400Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (3).| CWES updated (1)." }, { "date": "2026-04-01T21:38:53.303880Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-04-01T23:28:44.335815Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-04-01T23:28:46.027275Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-04-02T14:59:12.681624Z", "number": "7", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-04-02T17:39:21.457132Z", "number": "8", "summary": "Unknown change." }, { "date": "2026-04-02T18:44:48.194058Z", "number": "9", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products created (2)." } ], "status": "interim", "version": "9" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<4.8.1", "product": { "name": "vers:unknown/<4.8.1", "product_id": "CSAFPID-5982481" } } ], "category": "product_name", "name": "Flask-HTTPAuth" } ], "category": "vendor", "name": "miguelgrinberg" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-5985170" } } ], "category": "product_name", "name": "python-flask-httpauth" } ], "category": "product_family", "name": "bookworm" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-5985171" } } ], "category": "product_name", "name": "python-flask-httpauth" } ], "category": "product_family", "name": "bullseye" } ], "category": "vendor", "name": "debian" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-34531", "notes": [ { "category": "description", "text": "## Summary\n\nIn a situation where the client makes a request to a token protected resource without passing a token, or passing an empty token, Flask-HTTPAuth would invoke the application's token verification callback function with the `token` argument set to an empty string. If the application had any users in its database with an empty string set as their token, then it could potentially authenticate the client request against any of those users.\n\n## Notes\n\n- This issue applies only to token authentication\n- This issue applies only when the application verifies tokens by searching for them in a user database.\n- This issue applies only if the application stores empty strings as user tokens when the user does not have an assigned token. It does not apply if the application sets those tokens to `NULL` instead.\n- Tokens that are verified through cryptographic means (such as JWTs) are not affected by this issue.\n- Basic and Digest authentication are not affected by this issue.\n\n## Remediation\n\nTo protect against this issue, developers should make sure that no user in the user database has their `token` set to an empty string. If there are such users, change the value of those tokens to `NULL` instead.\n\nAlternatively, developers can upgrade their projects to `Flask-HTTPAuth>=4.8.1`, which fixes this issue.", "title": "github - https://api.github.com/advisories/GHSA-p44q-vqpr-4xmg" }, { "category": "description", "text": "Flask-HTTPAuth provides Basic, Digest and Token HTTP authentication for Flask routes. Prior to version 4.8.1, in a situation where the client makes a request to a token protected resource without passing a token, or passing an empty token, Flask-HTTPAuth would invoke the application's token verification callback function with the token argument set to an empty string. If the application had any users in its database with an empty string set as their token, then it could potentially authenticate the client request against any of those users. This issue has been patched in version 4.8.1.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/34xxx/CVE-2026-34531.json" }, { "category": "description", "text": "Flask-HTTPAuth provides Basic, Digest and Token HTTP authentication for Flask routes. Prior to version 4.8.1, in a situation where the client makes a request to a token protected resource without passing a token, or passing an empty token, Flask-HTTPAuth would invoke the application's token verification callback function with the token argument set to an empty string. If the application had any users in its database with an empty string set as their token, then it could potentially authenticate the client request against any of those users. This issue has been patched in version 4.8.1.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-34531" }, { "category": "description", "text": "Flask-HTTPAuth provides Basic, Digest and Token HTTP authentication for Flask routes. Prior to version 4.8.1, in a situation where the client makes a request to a token protected resource without passing a token, or passing an empty token, Flask-HTTPAuth would invoke the application's token verification callback function with the token argument set to an empty string. If the application had any users in its database with an empty string set as their token, then it could potentially authenticate the client request against any of those users. This issue has been patched in version 4.8.1.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-34531" }, { "category": "other", "text": "0.00038", "title": "EPSS" }, { "category": "other", "text": "3.8", "title": "NCSC Score" }, { "category": "other", "text": "There is cwe data available from source Nvd", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5982481", "CSAFPID-5985170", "CSAFPID-5985171" ] }, "references": [ { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-p44q-vqpr-4xmg" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/34xxx/CVE-2026-34531.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-34531" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-34531" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd", "url": "https://github.com/miguelgrinberg/Flask-HTTPAuth/security/advisories/GHSA-p44q-vqpr-4xmg" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-p44q-vqpr-4xmg" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://github.com/miguelgrinberg/flask-httpauth/commit/b15ffe9e50e110d7174ccd944f642079e1dcf9ee" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://github.com/miguelgrinberg/Flask-HTTPAuth/releases/tag/v4.8.1" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-5982481", "CSAFPID-5985170", "CSAFPID-5985171" ] } ], "title": "CVE-2026-34531" } ] }