{"id":"CVE-2026-44657","aliases":["GHSA-p6fr-rxq7-xcg8"],"url":"https://o3.security/vulnerability/CVE-2026-44657","summary":"MantisBT: Stored XSS in File Download","details":"Using *show_inline=1* parameter and a valid *file_show_inline_token* CSRF token on file_download.php, an attacker can execute code by uploading a crafted XHTML attachment referencing a JavaScript attachment.\n\n### Impact\nCross-site scripting\n\n### Patches\n- 26647b2e68ba30b9d7987d4e03d7a16416684bc2\n\n### Workarounds\nNone\n\n### Credits\nThanks to siunam (Tang Cheuk Hei) for discovering and responsibly reporting the issue.","published":"2026-05-28T20:25:26.816Z","modified":"2026-08-12T03:51:31.392712377Z","cvss":null,"epss":{"score":0.00349,"percentile":0.27867,"asOf":"2026-08-14"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"mantisbt/mantisbt","fixedVersion":"2.28.2"}],"fix":{"url":"https://github.com/mantisbt/mantisbt/commit/26647b2e68ba30b9d7987d4e03d7a16416684bc2","label":"mantisbt/mantisbt@26647b2"},"references":[{"type":"WEB","url":"https://mantisbt.org/bugs/view.php?id=37020"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44657.json"},{"type":"ADVISORY","url":"https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3"},{"type":"ADVISORY","url":"https://github.com/mantisbt/mantisbt/security/advisories/GHSA-p6fr-rxq7-xcg8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44657"},{"type":"FIX","url":"https://github.com/mantisbt/mantisbt/commit/26647b2e68ba30b9d7987d4e03d7a16416684bc2"},{"type":"PACKAGE","url":"https://github.com/mantisbt/mantisbt"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:31.392712377Z"}}