{"id":"CVE-2026-40596","aliases":["EUVD-2026-31492","GHSA-j3v9-553h-x28j"],"status":"published","title":"MantisBT is vulnerable to XSS and potential account takeover via user font family preference update","description":"Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.11.0 through 2.28.1 allow any authenticated user to inject arbitrary HTML by updating their account's font family. Upon exploitation, an XSS payload would be reflected on every MantisBT page. Leveraging another vulnerability (CSP bypass, see GHSA-9c3j-xm6v-j7j3), the attacker could achieve account takeover. This issue has been fixed in version 2.28.2.","severity":{"version":"4.0","score":7.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:L","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.00424,"percentile":0.36956,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2026-05-11T19:34:38Z","modified":"2026-10-28T02:31:14Z","fixes":[{"ecosystem":"Packagist","package":"mantisbt/mantisbt","fixed_in":["2.28.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"mantisbt/mantisbt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.11.0"},{"last_affected":"2.28.1"},{"fixed":"2.28.2"}]}]},{"source":"osv","ecosystem":"Packagist","package":"mantisbt/mantisbt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.11.0"},{"fixed":"2.28.2"}]}],"versions":["2.11.0","2.11.1","2.12.0","2.12.1","2.12.2","2.13.0","2.13.1","2.13.2","2.14.0","2.15.0","2.15.1","2.16.0","2.16.1","2.17.0","2.17.1","2.17.2","2.18.0","2.18.1","2.19.0","2.19.1","2.20.0","2.20.1","2.21.0","2.21.1","2.21.2","2.21.3","2.22.0","2.22.1","2.22.2","2.23.0","2.23.1","2.24.0","2.24.1","2.24.2","2.24.3","2.24.4","2.24.5","2.25.0","2.25.1","2.25.2","2.25.3","2.25.4","2.25.5","2.25.6","2.25.7","2.25.8","2.26.0","2.26.1","2.26.2","2.26.3","2.26.4","2.27.0","2.27.1","2.27.2","2.27.3","2.28.0","2.28.1"]}],"products":[{"vendor":"mantisbt","product":"mantisbt"}],"references":[{"url":"https://github.com/mantisbt/mantisbt/security/advisories/GHSA-j3v9-553h-x28j","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3","tags":["x_refsource_MISC","advisory","web"]},{"url":"https://github.com/mantisbt/mantisbt/commit/9e8409cdd979eba86ef532756fc47c1d8112d22d","tags":["x_refsource_MISC","fix","web"]},{"url":"https://mantisbt.org/bugs/view.php?id=37011","tags":["x_refsource_MISC","web"]},{"url":"https://mantisbt.org/bugs/view.php?id=37016","tags":["x_refsource_MISC","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40596","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-j3v9-553h-x28j"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40596.json","tags":["advisory"]},{"url":"https://github.com/mantisbt/mantisbt","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-40596","title":"MantisBT is vulnerable to XSS and potential account takeover via user font family preference update","description":"Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.11.0 through 2.28.1 allow any authenticated user to inject arbitrary HTML by updating their account's font family. Upon exploitation, an XSS payload would be reflected on every MantisBT page. Leveraging another vulnerability (CSP bypass, see GHSA-9c3j-xm6v-j7j3), the attacker could achieve account takeover. This issue has been fixed in version 2.28.2.","status":"published","published":"2026-05-22T19:25:32.812Z","modified":"2026-05-22T20:10:16.176Z","cvss":[{"version":"4.0","score":7.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:L","level":"high","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T13:43:22.599321Z"}],"euvd":[{"id":"EUVD-2026-31492","description":"Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.11.0 through 2.28.1 allow any authenticated user to inject arbitrary HTML by updating their account's font family. Upon exploitation, an XSS payload would be reflected on every MantisBT page. Leveraging another vulnerability (CSP bypass, see GHSA-9c3j-xm6v-j7j3), the attacker could achieve account takeover. This issue has been fixed in version 2.28.2.","status":"published","published":"2026-05-22T19:25:32Z","modified":"2026-05-22T20:10:16Z","cvss":[{"version":"4.0","score":7.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:L","level":"high"}],"updated_at":"2026-11-02T18:21:12.112235Z"}],"ghsa":[{"id":"GHSA-j3v9-553h-x28j","title":"MantisBT is Vulnerable to XSS leading to account takeover via updating a user's font family preference","description":"Any authenticated user can inject arbitrary HTML via updating their account's font family.\n\n### Impact\nCross-site scripting.\nThe injected payload will be reflected in every MantisBT page.\n\nLeveraging another vulnerability (CSP bypass, see [GHSA-9c3j-xm6v-j7j3](https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3)), the attacker could achieve account takeover.\n\n### Patches\n- 9e8409cdd979eba86ef532756fc47c1d8112d22d\n\n### Workarounds\nNone\n\n### Credits\nThanks to siunam (Tang Cheuk Hei) for discovering and responsibly reporting the issue.","status":"published","published":"2026-05-11T19:34:38Z","modified":"2026-06-08T23:20:18Z","cvss":[{"version":"4.0","score":7.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:L","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:40:20.187636Z"}],"nvd":[{"id":"CVE-2026-40596","description":"Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.11.0 through 2.28.1 allow any authenticated user to inject arbitrary HTML by updating their account's font family. Upon exploitation, an XSS payload would be reflected on every MantisBT page. Leveraging another vulnerability (CSP bypass, see GHSA-9c3j-xm6v-j7j3), the attacker could achieve account takeover. This issue has been fixed in version 2.28.2.","status":"published","published":"2026-05-22T20:16:34.18Z","modified":"2026-07-23T16:10:00.137Z","cvss":[{"version":"4.0","score":7.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:20.131508Z"}],"osv":[{"id":"CVE-2026-40596","title":"MantisBT is vulnerable to XSS and potential account takeover via user font family preference update","description":"Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.11.0 through 2.28.1 allow any authenticated user to inject arbitrary HTML by updating their account's font family. Upon exploitation, an XSS payload would be reflected on every MantisBT page. Leveraging another vulnerability (CSP bypass, see GHSA-9c3j-xm6v-j7j3), the attacker could achieve account takeover. This issue has been fixed in version 2.28.2.","status":"published","published":"2026-05-22T19:25:32.812Z","modified":"2026-10-28T02:31:14.84560027Z","cvss":[{"version":"4.0","score":7.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:L","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:45:03.424067Z"},{"id":"GHSA-j3v9-553h-x28j","title":"MantisBT is Vulnerable to XSS leading to account takeover via updating a user's font family preference","description":"Any authenticated user can inject arbitrary HTML via updating their account's font family.\n\n### Impact\nCross-site scripting.\nThe injected payload will be reflected in every MantisBT page.\n\nLeveraging another vulnerability (CSP bypass, see [GHSA-9c3j-xm6v-j7j3](https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3)), the attacker could achieve account takeover.\n\n### Patches\n- 9e8409cdd979eba86ef532756fc47c1d8112d22d\n\n### Workarounds\nNone\n\n### Credits\nThanks to siunam (Tang Cheuk Hei) for discovering and responsibly reporting the issue.","status":"published","published":"2026-05-11T19:34:38Z","modified":"2026-09-10T03:51:05.993474329Z","cvss":[{"version":"4.0","score":7.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:L","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:49.977351Z"}]}}