Quick answers
- Is CVE-2026-62854 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-62854 being exploited in the wild.
- How severe is CVE-2026-62854?
- High severity, with a CVSS score of 7.6, published 6 November 2026.
- Which products and versions are affected?
- FreeScout prior to 1.8.225.
- Is there a fix for CVE-2026-62854?
- Yes: fixed in 1.8.225. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-62854 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-62854?
- Check whether you run FreeScout at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 1.8.225
Technical details
A stored cross-site scripting vulnerability exists in FreeScout's Helper::stripDangerousTags() function, which fails to recursively strip nested dangerous HTML tags from mailbox signatures. An attacker with mailbox signature edit permissions can combine a scriptable file uploaded via /uploads/upload with nested tag fragments to bypass the filter. The resulting script is served from the same origin and permitted by the script-src 'self' Content Security Policy, executing with the victim's privileges when they open the mailbox reply editor or new-ticket creation page.
Affected products
- FreeScout FreeScout prior to 1.8.225
Timeline
- 2026-11-06: disclosed
- 2026-11-06: patched: Fix implemented via improved stripDangerousTags() with recursive removal of nested tags