PT-2025-48564 · Grav · Grav

Published 2025-12-01 · Updated 2025-12-02 · CVE-2025-66305

Positive Technologies (AI Summary)

CVSS v4.0

6.9

Medium

Base vector

AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Grav versions prior to 1.8.0-beta.27

Description Grav is a file-based Web platform. A denial of service issue exists in the "Languages" submenu of the Grav admin configuration panel at /admin/config/system. The Supported parameter does not properly validate user input. Providing a malformed value, such as a single forward slash (/) or an XSS test string, causes a fatal regular expression parsing error when using the preg match() function with an improperly constructed regular expression. This results in application-wide failure and renders the site unavailable to all users.

Recommendations Update to Grav version 1.8.0-beta.27 or later.

Exploit

Fix

DoS

Weakness Enumeration

CWE-248

Related Identifiers

CVE-2025-66305

GHSA-M8VH-V6R6-W7P6

Affected Products

Grav

References · 7

• 🔥 https://github.com/getgrav/grav/security/advisories/GHSA-m8vh-v6r6-w7p6 · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66305.json · Exploit
• https://github.com/getgrav/grav/commit/ed640a13143c4177af013cf001969ed2c5e197ee · Patch
• https://osv.dev/vulnerability/CVE-2025-66305 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-66305 · Security Note
• https://twitter.com/CVEnew/status/1995611522546991317 · Twitter Post
• https://t.me/CVEtracker/38596 · Telegram Post