Executive brief
The Grav API Plugin, which provides programmatic access to the Grav CMS, contains a security flaw that allows users with limited administrative permissions to modify critical security settings. An attacker with these permissions could disable site-wide rate limiting or change security policies (CORS) to allow malicious websites to interact with the API. This could lead to large-scale brute-force attacks against user passwords or unauthorized access to sensitive data.
Technical details
A broken access control vulnerability exists in the ConfigController of the Grav API Plugin. The component fails to include the 'plugins/api' scope within its 'SUPER_WRITE_SCOPES' or 'PRIVILEGED_SCOPES' constants, which are intended to gate security-sensitive configurations. Consequently, an authenticated user possessing only the 'api.config.write' permission (rather than 'api.super') can issue PATCH requests to /config/plugins/api. This allows an attacker to disable site-wide rate limiting, facilitating brute-force attacks, or modify CORS policies to include attacker-controlled origins with credentials enabled. The issue is resolved in version 1.0.10.
Affected products
- getgrav Grav API Plugin < 1.0.10
Timeline
- 2026-07-09: advisory: GitHub Security Advisory published
- 2026-07-23: disclosed: NVD publication date