MEDIUM 5.1 NVD
CVE-2026-105090
Formbricks before 5.4.4 and 6 before 6.0.1 allows stored XSS. The survey-level Custom Head Scripts feature did not enforce the documented Manage permission boun
Formbricks before 5.4.4 and 6 before 6.0.1 allows stored XSS. The survey-level Custom Head Scripts feature did not enforce the documented Manage permission boundary. A workspace member holding only readWrite permission could configure Custom Head Scripts on a survey, an operation the documentation restricts to the Manage role. Because the configured scripts execute in the authenticated browser session of any user who opens the affected survey, a lower-privileged member can run arbitrary JavaScript (stored cross-site scripting) in the session of higher-privileged users. Fixed versions require Manage access to modify survey Custom Head Scripts.
References
- https://github.com/formbricks/formbricks/pull/9432
- https://github.com/formbricks/formbricks/releases/tag/5.4.4
- https://github.com/formbricks/formbricks/releases/tag/6.0.1
- https://www.sec4check.pl/blog/posts/cve-formbricks-broken-access-control-stored-xss-custom
This medium severity vulnerability with a CVSS score of 5.1 was published on 2026-10-03 via NVD.
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