Critical
Formie: Pre-authenticated server-side template injection in Hidden fields
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
Workarounds
- Temporarily remove Hidden fields from public forms or switch Hidden default away from Custom where feasible
- Otherwise, upgrade to patched versions
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | verbb/formie | >= 3.0.0-beta.1, < 3.1.24, < 2.2.20 | 3.1.24, 2.2.20 |
References
- https://github.com/verbb/formie/security/advisories/GHSA-x7m9-mwc2-g6w2
- https://nvd.nist.gov/vuln/detail/CVE-2026-45697
- https://github.com/verbb/formie/commit/f690d5623163ce2a95da305238d6367575486ee3
- https://github.com/verbb/formie
- https://github.com/verbb/formie/releases/tag/2.2.20
- https://github.com/verbb/formie/releases/tag/3.1.24
CVSS score
9.8/10
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-1336, CWE-693, CWE-94- Platform
- Composer
- Package
verbb/formie- Disclosed
- 18.05.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-x7m9-mwc2-g6w2 - CC BY 4.0
Vulnerability history: verbb/formie
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 10
- First → latest
- 05.2024 09.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 2
- High 4
- Medium 4
Disclosures per year
- 2024: 1
- 2025: 2
- 2026: 7
-
Formie: Pre-authenticated server-side template injection in Hidden fields this entry
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