CVE-2026-52889: Formie Hidden field defaults vulnerable to Server-Side Template Injection

critical Affects verbb/formie. Feed 2026.10.29.1, updated 2026-10-28; published 2026-07-06; advisory modified 2026-09-10.

Formie Hidden field defaults vulnerable to Server-Side Template Injection

Package: verbb/formie Composer
Affected versions: <3.1.27
Fixed in: 3.1.27
Severity: critical CVSS 9.8
Exploitation: not on CISA KEV · EPSS 1% (69.8th percentile)
Published: 2026-07-06
Source: osv.dev

References

CWE-1336

NVD record verbb/formie advisories

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# one-time install
pip install phpwarden

# then
phpwarden deps composer.lock

Or keep it checked automatically: GitHub Action · pre-commit hook · GitLab CI · Laravel artisan command

Install docs How findings are ranked

Related advisories

CVE-2026-76086 high Formie: Integration form-settings action allows SSRF and exfiltration of stored integratio same package: verbb/formie
CVE-2026-45697 critical Formie: Pre-authenticated server-side template injection in Hidden fields same package: verbb/formie
CVE-2026-76089 high Formie: Missing authorization on sent notification resend modal exposes submission PII same package: verbb/formie
CVE-2026-76087 high Formie: Unauthenticated users can overwrite incomplete submissions via submit action same package: verbb/formie
CVE-2026-47266 high formie's unauthenticated front-end submission editing can overwrite existing submissions same package: verbb/formie
CVE-2024-35191 medium verbb/formie Server-Side Template Injection for variable-enabled settings same package: verbb/formie