{"id":"CVE-2026-62854","aliases":["EUVD-2026-118363","GHSA-jpq8-j69f-mj98"],"status":"published","title":"FreeScout: Stored XSS in mailbox signature via same-origin JS upload","description":"FreeScout is a self-hosted help desk and shared mailbox. Prior to 1.8.225, a user who can edit a mailbox signature can combine a scriptable file uploaded through /uploads/upload with nested tag fragments that bypass Helper::stripDangerousTags(). The resulting external script is served from the same origin, so the script-src 'self' policy permits it when another user opens the affected mailbox reply editor or new-ticket page. The script executes with the victim's FreeScout privileges and can read visible data and perform same-origin actions. This issue is fixed in version 1.8.225.","severity":{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00215,"percentile":0.11882,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-11-06T16:50:58Z","modified":"2026-11-07T02:48:39Z","products":[{"vendor":"freescout-help-desk","product":"freescout"}],"references":[{"url":"https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-jpq8-j69f-mj98","tags":["x_refsource_CONFIRM","advisory"]},{"url":"https://github.com/freescout-help-desk/freescout/commit/315ad05f73886649cb8bc2c014dd74b62cc28502","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/freescout-help-desk/freescout/commit/7f6a5042c1326ceaf511f13982178dce036cedbe","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/freescout-help-desk/freescout/releases/tag/1.8.225","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62854.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-62854","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-62854","title":"FreeScout: Stored XSS in mailbox signature via same-origin JS upload","description":"FreeScout is a self-hosted help desk and shared mailbox. Prior to 1.8.225, a user who can edit a mailbox signature can combine a scriptable file uploaded through /uploads/upload with nested tag fragments that bypass Helper::stripDangerousTags(). The resulting external script is served from the same origin, so the script-src 'self' policy permits it when another user opens the affected mailbox reply editor or new-ticket page. The script executes with the victim's FreeScout privileges and can read visible data and perform same-origin actions. This issue is fixed in version 1.8.225.","status":"published","published":"2026-11-06T16:50:58.184Z","modified":"2026-11-06T16:50:58.184Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-06T17:28:53.22449Z"}],"euvd":[{"id":"EUVD-2026-118363","description":"FreeScout is a self-hosted help desk and shared mailbox. Prior to 1.8.225, a user who can edit a mailbox signature can combine a scriptable file uploaded through /uploads/upload with nested tag fragments that bypass Helper::stripDangerousTags(). The resulting external script is served from the same origin, so the script-src 'self' policy permits it when another user opens the affected mailbox reply editor or new-ticket page. The script executes with the victim's FreeScout privileges and can read visible data and perform same-origin actions. This issue is fixed in version 1.8.225.","status":"published","published":"2026-11-06T16:50:58Z","modified":"2026-11-06T16:50:58Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N","level":"high"}],"updated_at":"2026-11-06T18:05:41.257798Z"}],"nvd":[{"id":"CVE-2026-62854","description":"FreeScout is a self-hosted help desk and shared mailbox. Prior to 1.8.225, a user who can edit a mailbox signature can combine a scriptable file uploaded through /uploads/upload with nested tag fragments that bypass Helper::stripDangerousTags(). The resulting external script is served from the same origin, so the script-src 'self' policy permits it when another user opens the affected mailbox reply editor or new-ticket page. The script executes with the victim's FreeScout privileges and can read visible data and perform same-origin actions. This issue is fixed in version 1.8.225.","status":"published","published":"2026-11-06T17:18:33.7Z","modified":"2026-11-06T17:18:33.7Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-06T20:01:16.993748Z"}],"osv":[{"id":"CVE-2026-62854","title":"FreeScout: Stored XSS in mailbox signature via same-origin JS upload","description":"FreeScout is a self-hosted help desk and shared mailbox. Prior to 1.8.225, a user who can edit a mailbox signature can combine a scriptable file uploaded through /uploads/upload with nested tag fragments that bypass Helper::stripDangerousTags(). The resulting external script is served from the same origin, so the script-src 'self' policy permits it when another user opens the affected mailbox reply editor or new-ticket page. The script executes with the victim's FreeScout privileges and can read visible data and perform same-origin actions. This issue is fixed in version 1.8.225.","status":"published","published":"2026-11-06T16:50:58.184Z","modified":"2026-11-08T02:47:42.656018388Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-08T03:29:52.421856Z"}]}}