CVE-2025-66305
Description
Grav is a file-based Web platform. Prior to 1.8.0-beta.27, a Denial of Service (DoS) vulnerability was identified in the "Languages" submenu of the Grav admin configuration panel (/admin/config/system). Specifically, the Supported parameter fails to properly validate user input. If a malformed value is inserted—such as a single forward slash (/) or an XSS test string—it causes a fatal regular expression parsing error on the server. This leads to application-wide failure due to the use of the preg_match() function with an improperly constructed regular expression, resulting in an error. Once triggered, the site becomes completely unavailable to all users. This vulnerability is fixed in 1.8.0-beta.27.
How to fix
- getgrav grav1.8.0 or later
- getgrav/grav1.8.0-beta.27 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| getgrav grav | 1.7.48 ≤ v < 1.8.0, 1.8.0 | 1.8.0 |
| getgrav/gravPackagist | v < 1.8.0-beta.27 | 1.8.0-beta.27 |
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