CVE-2026-45697

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

CVSS 9.8 CRITICALEPSS 0.5%CWE-1336 CWE-693 CWE-94

Vexday Risk Score

28Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 9.8EPSS 0.5%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

29 May 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

Formie is a Craft CMS plugin for creating forms. Prior to 2.2.20 and 3.1.24, 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). This vulnerability is fixed in 2.2.20 and 3.1.24.

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

Affected products

verbb · formie

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References

https://github.com/verbb/formie/commit/f690d5623163ce2a95da305238d6367575486ee3 https://github.com/verbb/formie/releases/tag/2.2.20 https://github.com/verbb/formie/releases/tag/3.1.24 https://github.com/verbb/formie/security/advisories/GHSA-x7m9-mwc2-g6w2