CVE-2026-75827

Description

Grav before 2.0.15 contains an arbitrary file write vulnerability in the Blueprint dynamic-data bare-function validation that uses an incomplete denylist instead of a positive allowlist. Attackers with page-edit or blueprint-config access can invoke the error_log function through a data directive to append PHP payloads to web-accessible files, achieving remote code execution.

CVSS Vector

References

• https://github.com/getgrav/grav/security/advisories/GHSA-f8wv-xp27-6gq7
• https://www.vulncheck.com/advisories/grav-before-arbitrary-file-write-via-error-log