CVE-2026-75827

High

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.

SeverityHigh

CVSS8.8

Exploit probability59. percentile0.9%

ProductGetgrav/grav

PublishedAug 18, 2026

First seenAug 18, 2026

Weakness typeCWE-94Code injection

How to fix

Update

getgrav/grav2.0.15 or later

Vendor advisories

github.com/getgrav/grav/security/advisories/GHSA-f8wv-xp27-6gq7

Affected products

Product	Affected versions	Fixed in
getgrav/gravPackagist	v < 2.0.15	2.0.15

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