Medium 5.1Published Oct 3, 2026

CVE-2026-105090Formbricks before 5.4.4 and 6 before 6.0.1 allows stored XSS.

Updated under an hour ago (2026-10-19 10:00 UTC)

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It affects Formbricks. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Formbricks

Exploited in the last 30 days

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.

CVSS: 5.1 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Weakness (CWE): CWE-863
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mitre
NVD analysis: Awaiting Analysis
Record last updated: Oct 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Formbricks Formbricks formbricks:formbricks (from the name)	before 5.4.4; from 6.0.0 before 6.0.1	CNA record

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.