Vulnerability · Published Aug 18, 2026 · Assigned by VulnCheck

CVE-2026-75827Grav before 2.0.15 Arbitrary File Write via error_log

High 8.8

In plain English

A high-severity code injection in grav from getgrav. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.9%top 41.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack tooling1Public PoC

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	getgrav/grav	2.0.15	GHSA-f8wv-xp27-6gq7

Affected products (as reported)

Vendor	Product	Versions
getgrav	grav	0 – before 2.0.15

Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-f8wv-xp27-6gq7) vendor-advisory
VulnCheck Advisory: Grav before 2.0.15 Arbitrary File Write via error_log third-party-advisory