Vulnerability · Published Sep 23, 2026 · Assigned by GitHub_M
CVE-2026-76087Formie: Unauthenticated users can overwrite incomplete submissions via submit action
High 8.2
In plain English
A high-severity authorization bypass via user-controlled key in formie from verbb. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | verbb/formie | 3.1.31 | GHSA-584p-f93j-wpgc |
| Packagist | verbb/formie | 2.2.23 | GHSA-584p-f93j-wpgc |
Affected products (as reported)
Weakness: CWE-639, CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
References
- https://github.com/verbb/formie/security/advisories/GHSA-584p-f93j-wpgc x_refsource_CONFIRM
- https://github.com/verbb/formie/commit/323c2fe647a76fbccadf749728ee4ad9420efee1 x_refsource_MISC
- https://github.com/verbb/formie/commit/78a298ac3baf85ac283988dfce9cd42c9b958f16 x_refsource_MISC
- https://github.com/verbb/formie/releases/tag/2.2.23 x_refsource_MISC
- https://github.com/verbb/formie/releases/tag/3.1.31 x_refsource_MISC