Formie: Unauthenticated users can overwrite incomplete submissions via submit action
Impact
The anonymous front-end action formie/submissions/submit (SubmissionsController::actionSubmit) trusted a client-supplied submissionId when loading an incomplete submission, with no session binding, ownership check, or edit token validation.
An unauthenticated attacker could enumerate sequential submission IDs and overwrite or hijack another user's in-progress (multi-page / save-for-later) submission. Tampered data could be persisted and forwarded via notifications and integrations when the submission was completed.
Completed submissions were not affected (isIncomplete=true filter). This is an incomplete remediation of GHSA-pgxq-p76c-x9cg, which added edit-token validation to save-submission but not to submit.
Patches
Fixed in 3.1.31 (Craft 5) and 2.2.23 (Craft 4).
When resuming an existing submission on a site request, the submission ID must match the session-bound submission (Form::getCurrentSubmission()) or a valid submissionEditToken when editingSubmission is set. Cross-form submission ID reuse is also rejected.
Workarounds
No reliable workaround without upgrading. Disabling multi-page forms or save-for-later reduces exposure but does not remove the vulnerability.
- Reported by Jorge González (jorge@jmilla.es)
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | verbb/formie | >= 3.0.0, < 3.1.31, < 2.2.23 | 3.1.31, 2.2.23 |
References
- https://github.com/verbb/formie/security/advisories/GHSA-584p-f93j-wpgc
- https://github.com/verbb/formie/commit/323c2fe647a76fbccadf749728ee4ad9420efee1
- https://github.com/verbb/formie/commit/78a298ac3baf85ac283988dfce9cd42c9b958f16
- https://github.com/verbb/formie
- https://github.com/verbb/formie/releases/tag/2.2.23
- https://github.com/verbb/formie/releases/tag/3.1.31
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N- Weakness (CWE)
CWE-639, CWE-862- Platform
- Composer
- Package
verbb/formie- Disclosed
- 23.09.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-584p-f93j-wpgc - CC BY 4.0
Vulnerability history: verbb/formie
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 10
- First → latest
- 05.2024 09.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 2
- High 4
- Medium 4
Disclosures per year
- 2024: 1
- 2025: 2
- 2026: 7
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Formie: Unauthenticated users can overwrite incomplete submissions via submit action this entry
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