What’s Vulnerable › Vulnerabilities

CVE-2026-110620: Formbricks before 4.9.0 Cross-Organization IDOR in Server Actions via organizationId

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-26
• Weakness: CWE-639

Description

Formbricks before 4.9.0 contains an authorization bypass vulnerability in server actions like resetSurveyAction and updateSegmentAction that fail to verify resource ownership against the supplied organizationId. Authenticated owners or managers of any organization can pair their own organization identifier with victim resource IDs to delete survey responses, modify segments and quotas, or alter pending invitations.

Affected products

• formbricks: before 4.9.0 — fixed in 4.9.0

How to fix

Upgrade to a fixed version: formbricks 4.9.0. Check the vendor advisory for mitigations.

References

• https://github.com/formbricks/formbricks/blob/4.8.7/apps/web/app/(app)/environments/%5BenvironmentId%5D/surveys/%5BsurveyId%5D/(analysis)/summary/actions.ts#L65-L95
• https://github.com/formbricks/formbricks/blob/4.8.7/apps/web/modules/organization/settings/teams/actions.ts#L33-L50
• https://github.com/formbricks/formbricks/commit/c7faa29437ea706eae411958b260bb5ad5c60e4f
• https://github.com/formbricks/formbricks/issues/7326
• https://github.com/formbricks/formbricks/releases/tag/4.9.0
• https://www.vulncheck.com/advisories/formbricks-before-4.9.0-cross-organization-idor-in-server-actions-via-organizationid

Get alerted when CVE-2026-110620 or the next vulnerability affects your stack