{"id":"CVE-2026-62854","title":"FreeScout: Stored XSS in mailbox signature via same-origin JS upload","summary":"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::stripDangerou…","severity":"high","cvss":7.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N","cvssSource":"cna","cwe":["CWE-79"],"vendor":"freescout-help-desk","product":"freescout","affected":["freescout < 1.8.225"],"published":"2026-11-06","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:50:58.184Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-62854","references":[{"url":"https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-jpq8-j69f-mj98","label":"https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-jpq8-j69f-mj98"},{"url":"https://github.com/freescout-help-desk/freescout/commit/315ad05f73886649cb8bc2c014dd74b62cc28502","label":"https://github.com/freescout-help-desk/freescout/commit/315ad05f73886649cb8bc2c014dd74b62cc28502"},{"url":"https://github.com/freescout-help-desk/freescout/commit/7f6a5042c1326ceaf511f13982178dce036cedbe","label":"https://github.com/freescout-help-desk/freescout/commit/7f6a5042c1326ceaf511f13982178dce036cedbe"},{"url":"https://github.com/freescout-help-desk/freescout/releases/tag/1.8.225","label":"https://github.com/freescout-help-desk/freescout/releases/tag/1.8.225"}],"tags":["cve.org"],"ingestedAt":"2026-11-06T18:00:12.621Z","slug":"CVE-2026-62854","body":"## Overview\n\nFreeScout 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.\n\n## Affected\n\n- `freescout < 1.8.225`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}