CVE-2026-105090

MEDIUM
5.1
CVSS Score
Published: October 3, 2026 at 01:59 AM UTC
Updated: October 6, 2026 at 04:08 PM UTC
1 product affected across 1 vendorFormbricks

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Severity
MEDIUM5.1
Exploit prediction
EPSS 0.3%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 5.4.46.0.0 ≤ v < 6.0.16.0.0
Affected range stops below 5.4.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.0.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.1MEDIUMmitre
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-863

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