Formie: Unauthenticated users can overwrite incomplete submissions via submit action

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-76087
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-23 19:19:14 UTC
Updated2026-09-30 17:32:07 UTC
DescriptionFormie 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.

Risk And Classification

Primary CVSS: v3.1 8.2 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

EPSS: 0.003130000 probability, percentile 0.219000000 (date 2026-10-01)

Problem Types: CWE-639 | CWE-862 | CWE-639 CWE-639: Authorization Bypass Through User-Controlled Key | CWE-862 CWE-862: Missing Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
3.1CNADECLARED8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Verbb Formie affected < 2.2.23 Not specified
CNA Verbb Formie affected >= 3.0.0, < 3.1.31 Not specified

References

ReferenceSourceLinkTags
github.com/verbb/formie/commit/78a298ac3baf85ac283988dfce9cd42c9b958f16 [email protected] github.com
github.com/verbb/formie/releases/tag/3.1.31 [email protected] github.com
github.com/verbb/formie/security/advisories/GHSA-584p-f93j-wpgc [email protected] github.com
github.com/verbb/formie/releases/tag/2.2.23 [email protected] github.com
github.com/verbb/formie/commit/323c2fe647a76fbccadf749728ee4ad9420efee1 [email protected] github.com
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