{ "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-2026-30878", "tracking": { "current_release_date": "2026-04-01T23:29:39.714765Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-30878", "initial_release_date": "2026-03-31T01:25:34.322370Z", "revision_history": [ { "date": "2026-03-31T01:25:34.322370Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-31T01:25:36.121617Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-31T01:38:44.272193Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (3).| CWES updated (1)." }, { "date": "2026-03-31T01:38:49.465517Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-31T07:35:09.111956Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-31T17:02:35.324374Z", "number": "6", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-31T19:38:48.311947Z", "number": "7", "summary": "Unknown change." }, { "date": "2026-03-31T23:07:43.865093Z", "number": "8", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (5).| CWES updated (1)." }, { "date": "2026-03-31T23:07:54.662172Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-04-01T23:25:54.594070Z", "number": "10", "summary": "Products connected (1).| Product Identifiers created (1).| Exploits created (1)." }, { "date": "2026-04-01T23:25:58.543781Z", "number": "11", "summary": "NCSC Score updated." } ], "status": "interim", "version": "11" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<5.2.3", "product": { "name": "vers:unknown/<5.2.3", "product_id": "CSAFPID-5982832", "product_identification_helper": { "cpe": "cpe:2.3:a:basercms:basercms:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "baserCMS" } ], "category": "vendor", "name": "baserCMS" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<5.2.3", "product": { "name": "vers:unknown/<5.2.3", "product_id": "CSAFPID-5966272" } } ], "category": "product_name", "name": "basercms" } ], "category": "vendor", "name": "baserproject" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-30878", "notes": [ { "category": "description", "text": "baserCMS is a website development framework. Prior to version 5.2.3, a public mail submission API allows unauthenticated users to submit mail form entries even when the corresponding form is not accepting submissions. This bypasses administrative controls intended to stop form intake and enables spam or abuse via the API. This issue has been patched in version 5.2.3.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-30878" }, { "category": "description", "text": "baserCMS is a website development framework. Prior to version 5.2.3, a public mail submission API allows unauthenticated users to submit mail form entries even when the corresponding form is not accepting submissions. This bypasses administrative controls intended to stop form intake and enables spam or abuse via the API. This issue has been patched in version 5.2.3.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/30xxx/CVE-2026-30878.json" }, { "category": "description", "text": "### Summary\nA public mail submission API allows unauthenticated users to submit mail form entries even when the corresponding form is not accepting submissions. This bypasses administrative controls intended to stop form intake and enables spam or abuse via the API.\n\n### Details\nIn baserCMS, mail form submissions through the front-end UI are guarded by acceptance checks implemented in `MailFrontService::isAccepting()`, which ensures that the mail form is currently accepting submissions (e.g. within its configured publish/acceptance window).\n\nThese checks are enforced in the UI flow handled by `MailController::index()` and `MailController::confirm()` \n(e.g. `plugins/bc-mail/src/Controller/MailController.php`).\n\nHowever, the public API endpoint:\n\n`plugins/bc-mail/src/Controller/Api/MailMessagesController.php::add()`\n\ndoes not invoke `MailFrontService::isAccepting()` and does not verify whether the mail form is currently accepting submissions. As a result, the API accepts submissions regardless of the form’s acceptance state.\n\nThe endpoint does not require authentication. A valid CSRF cookie and token pair is sufficient to create a mail message. This allows submissions even when administrators intentionally disable or close the mail form via the admin UI.\n\n### PoC\n1. In the admin UI, configure a mail form so that it is **not accepting submissions** (e.g. outside its acceptance period or explicitly closed).\n2. Obtain a CSRF cookie by accessing the site root:\n```\ncurl -sS -D - -o - -c /tmp/basercms_cookies.txt 'http://localhost/'\n```\n3. Extract the CSRF token from the `csrfToken` cookie and submit a POST request to the public API endpoint:\n```\ncurl -sS -D - -o - -X POST 'http://localhost/baser/api/bc-mail/mail_messages/add/1.json' \n-H 'Content-Type: application/x-www-form-urlencoded' \n-H 'Referer: http://localhost/' \n-H 'X-CSRF-Token: ' \n-b /tmp/basercms_cookies.txt \n--data-urlencode 'name_1=Test' \n--data-urlencode 'name_2=User' \n--data-urlencode 'email_1=test@example.com' \n--data-urlencode 'email_2=test@example.com' \n--data-urlencode 'category[]=資料請求' \n--data-urlencode 'root=検索エンジン' \n--data-urlencode 'message=API bypass test'\n```\n4. The server responds with `200 OK` and creates a mail message, even though the form is configured to reject submissions.\n\n### Impact\nThis is an access control / business logic bypass vulnerability.\n\nAdministrators rely on the mail form acceptance settings to temporarily or permanently stop form intake (e.g. during maintenance, incidents, or spam attacks). This vulnerability allows attackers to bypass those controls via the public API, enabling unauthorized mail submissions, spam, and operational disruption.", "title": "github - https://api.github.com/advisories/GHSA-8cr7-r8qw-gp3c" }, { "category": "other", "text": "0.00047", "title": "EPSS" }, { "category": "other", "text": "3.6", "title": "NCSC Score" }, { "category": "other", "text": "Is related to (a version of) an uncommon product, There is exploit data available from source Nvd, Is related to an uncommon product vendor", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5966272", "CSAFPID-5982832" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-30878" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/30xxx/CVE-2026-30878.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-8cr7-r8qw-gp3c" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd", "url": "https://basercms.net/security/JVN_20837860" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd", "url": "https://github.com/baserproject/basercms/releases/tag/5.2.3" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd", "url": "https://github.com/baserproject/basercms/security/advisories/GHSA-8cr7-r8qw-gp3c" }, { "category": "external", "summary": "Reference - github", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-30878" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-8cr7-r8qw-gp3c" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-5966272", "CSAFPID-5982832" ] } ], "title": "CVE-2026-30878" } ] }