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Advisory record · GHSA-x7m9-mwc2-g6w2

Formie: Pre-authenticated server-side template injection in Hidden fields

CVSS 9.8 CriticalCriticalEPSS 0.0047 · 41st percentile

Critical, because:

  • CVSS score 9.8: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 18 May 2026, 17:23 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
verbb/formiePackagist>=3.0.0-beta.1, <3.1.24 || <2.2.203.1.24, 2.2.20
Identifiers
GHSA-x7m9-mwc2-g6w2 · CVE-2026-45697 · PKSA-snft-3cv8-v5p5
Weakness (CWE)
CWE-94 · CWE-693 · CWE-1336
Tags
Published
18 May 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Formie, a Craft CMS form plugin for Packagist package verbb/formie, is vulnerable in versions below 2.2.20 and from 3.0.0-beta.1 up to (not including) 3.1.24. An unauthenticated user can submit crafted values to Hidden fields configured with a Custom default value, and these values are evaluated as Twig during form submission, which could seriously compromise the Craft site depending on template sandbox behavior; no control panel login is needed. Upgrade to 2.2.20 or 3.1.24, or as a temporary workaround, remove Hidden fields from public forms or change their default away from Custom.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.8 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0047, the 41st percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:01 UTC First seen by agentprime
  2. 31 Oct 2026, 14:01 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.