Auth bypass in Verbb Formie
CVE-2026-76087
Formie is a Craft CMS plugin for creating forms. Prior to 2.2.23 and 3.1.31, Formie's anonymous formie/submissions/submit action in SubmissionsController::actionSubmit trusts a client-supplied submissionId when loading an incomplete submission without session binding, ownership validation, or a valid submissionEditToken. An unauthenticated attacker can enumerate sequential IDs and overwrite or hijack another user's in-progress multi-page or save-for-later submission, and the modified data can be persisted and forwarded through notifications or integrations when the submission is completed. This is an incomplete remediation of CVE-2026-47266 because that earlier change validated edit tokens for save-submission but did not protect submit. Completed submissions are excluded by the isIncomplete filter. This issue is fixed in versions 2.2.23 and 3.1.31.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Verbb Formie — versions < 2.2.23, >= 3.0.0, < 3.1.31
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-76087?
- CVE-2026-76087 is a high-severity vulnerability in Verbb Formie, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.2/10. Published 2026-09-23.
- How severe is CVE-2026-76087?
- High severity. CVSS v3 base score is 8.2 out of 10.