{"id":"CVE-2026-40597","summary":"MantisBT has a Content Security Policy bypass via attachments","details":"Mantis Bug Tracker (MantisBT) is an open source issue tracker. In versions 2.28.1 and below, given any pre-existing XSS / HTML injection vulnerability, an attacker can bypass the Content Security Policy's script-src directive by uploading a crafted attachment to any issue that, when accessed via the file_download.php link, will be downloaded with a valid JavaScript MIME type resulting in script execution. The uploaded payload must be sniffed as a valid JavaScript MIME type by PHP finfo (see file_create_finfo() API function). Non-JavaScript MIME types will not get imported in a \u003cscript\u003e tag by the browser, due to response header X-Content-Type-Options being set to nosniff, which requires all imported JavaScript files to be a valid JavaScript MIME type. This issue has been fixed in version 2.28.2.","aliases":["GHSA-9c3j-xm6v-j7j3"],"modified":"2026-07-08T08:05:11.122450582Z","published":"2026-05-22T19:29:46.728Z","database_specific":{"cwe_ids":["CWE-358","CWE-79"],"cna_assigner":"GitHub_M","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40597.json"},"references":[{"type":"WEB","url":"https://mantisbt.org/bugs/view.php?id=37016"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40597.json"},{"type":"ADVISORY","url":"https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40597"},{"type":"FIX","url":"https://github.com/mantisbt/mantisbt/commit/9e3bee2e7b909f4e3596985892b8bc8bee9e0bfe"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mantisbt/mantisbt","events":[{"introduced":"0"},{"fixed":"9e3bee2e7b909f4e3596985892b8bc8bee9e0bfe"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"2.28.2"}]}}],"versions":["release-2.28.1","release-2.28.0","release-2.27.0","release-2.26.0","release-2.25.0","release-2.24.0","release-2.23.0","release-2.22.0","release-2.21.0","release-2.20.0","release-2.19.0","release-2.18.0","release-2.17.0","release-2.16.0","release-2.15.0","release-2.14.0","release-2.13.0","release-2.12.0","release-2.11.0","release-2.10.0","release-2.9.0","release-2.8.0","release-2.7.0","release-2.6.0","release-2.5.0","release-2.4.0","release-2.3.0","release-2.2.0","release-2.1.0","release-2.0.0","release-2.0.0-rc.2","release-2.0.0-rc.1","release-2.0.0-beta.3","release-2.0.0-beta.2","release-2.0.0-beta.1","release-1.3.0-rc.2","release-1.3.0-rc.1","release-1.3.0-beta.3","release-1.3.0-beta.2","release-1.3.0-beta.1","release-1.2.0rc1","release-1.2.0a3","release-1.2.0a2","release-1.2.0a1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40597.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N"}]}