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Critical, CVSS 9.8

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

CVE-2026-45697GHSA-x7m9-mwc2-g6w2

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (verbb/formie 3.1.24, 2.2.20), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Packagist verbb/formie

    Affected
    >= 3.0.0-beta.1, < 3.1.24< 2.2.20
    Fixed in
    3.1.24, 2.2.20

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
9.8 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
  • CVE-2026-45697: 0.47% estimated exploitation activity in the next 30 days; percentile 41.13 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact - Unauthenticated users could submit crafted values into Hidden fields (with Default value → Custom) that were evaluated as Twig during submission handling, which could lead to serious compromise of the Craft site (depending on template/sandbox behavior). - Sites with public Formie forms that include at least one Hidden field with that configuration. - No CP login for the reported chain. Patches - 2.2.20, 3.1.24 Workarounds - Temporarily remove Hidden fields from public forms or switch Hidden default away from Custom where feasible - Otherwise, upgrade to patched versions

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-x7m9-mwc2-g6w2

Agent brief

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# Patch Next advisory brief: CVE-2026-45697

Advisory: Formie: Pre-authenticated server-side template injection in Hidden fields
IDs: CVE-2026-45697, GHSA-x7m9-mwc2-g6w2
Record: https://patchnext.com/advisories/cve-2026-45697 (revision 1, source checked 26 Oct 2026, 14:48 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: verbb/formie 3.1.24, 2.2.20. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist verbb/formie: affected >= 3.0.0-beta.1, < 3.1.24; < 2.2.20; fixed in 3.1.24, 2.2.20

## Suggested inspection (read-only)
- Packagist verbb/formie: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on verbb/formie.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-x7m9-mwc2-g6w2 (GitHub-reviewed advisory GHSA-x7m9-mwc2-g6w2 lists affected ranges: Packagist verbb/formie >=3.0.0-beta.1 =0 <2.2.20)

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