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

Quick assessment

Affected
verbb formie
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 8.2 · High

Affected Version Matrix 2

VendorProduct Version RangeStatus
verbb formie < 2.2.23 affected
>= 3.0.0, < 3.1.31 affected
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I. Basic Information for CVE-2026-76087

Vulnerability Information

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Vulnerability Title
Formie: Unauthenticated users can overwrite incomplete submissions via submit action
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
verbb formie < 2.2.23 -

II. Public POCs for CVE-2026-76087

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III. Intelligence Information for CVE-2026-76087

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Patches & Fixes for CVE-2026-76087 (2)

Other References for CVE-2026-76087 (3)

Same Patch Batch · verbb · 2026-09-23 · 3 CVEs total

CVE-2026-76086 8.5 HIGH Formie: Integration form-settings action allows SSRF and exfiltration of stored integratio
CVE-2026-76089 7.7 HIGH Formie: Missing authorization on sent notification resend modal exposes submission PII

IV. Related Vulnerabilities

Same product: formie
Same vendor: verbb
Same weakness: CWE-639

V. Comments for CVE-2026-76087

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