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.
History

Mon, 05 Oct 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sat, 03 Oct 2026 05:15:00 +0000

Type Values Removed Values Added
First Time appeared Formbricks
Formbricks formbricks
Vendors & Products Formbricks
Formbricks formbricks

Sat, 03 Oct 2026 04:15:00 +0000

Type Values Removed Values Added
Title Stored XSS via Custom Head Scripts in Formbricks

Sat, 03 Oct 2026 02:15:00 +0000

Type Values Removed Values Added
Description 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.
Weaknesses CWE-863
References
Metrics cvssV4_0

{'score': 5.1, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-10-03T01:59:10.911Z

Updated: 2026-10-05T17:05:12.057Z

Reserved: 2026-10-03T01:59:10.142Z

Link: CVE-2026-105090

cve-icon Vulnrichment

Updated: 2026-10-05T17:04:34.279Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-03T02:17:18.370

Modified: 2026-10-06T16:08:27.613

Link: CVE-2026-105090

cve-icon Redhat

No data.