CVE-2026-62854
FreeScout: Stored XSS in mailbox signature via same-origin JS upload
CVSS Score
7.6
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | freescout-help-desk |
| Product | freescout |
| Published | Nov 6, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
None
Affected Versions
freescout-help-desk / freescout
< 1.8.225
References
github.com: https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-jpq8-j69f-mj98 github.com: https://github.com/freescout-help-desk/freescout/commit/315ad05f73886649cb8bc2c014dd74b62cc28502 github.com: https://github.com/freescout-help-desk/freescout/commit/7f6a5042c1326ceaf511f13982178dce036cedbe github.com: https://github.com/freescout-help-desk/freescout/releases/tag/1.8.225