CVE-2026-105090

UNKNOWN 0.0

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-863
Vendor	formbricks
Product	formbricks
Published	Oct 3, 2026

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Affected Versions

Formbricks / Formbricks

0 < 5.4.4 6.0.0 < 6.0.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/formbricks/formbricks/releases/tag/6.0.1 github.com: https://github.com/formbricks/formbricks/releases/tag/5.4.4 github.com: https://github.com/formbricks/formbricks/pull/9432 sec4check.pl: https://www.sec4check.pl/blog/posts/cve-formbricks-broken-access-control-stored-xss-custom-head-scripts.html