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    CVE-2025-66305

    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.

    Published:Dec 1, 2025
    Last Modified:Dec 3, 2025
    EPS:Dec 1, 2025
    EPSS Score:0.00044
    CVSS Score:4.9

    Affected Products

    Vendor
    Getgrav
    Product
    Grav

    Exploits

    https://github.com/getgrav/grav/security/advisories/GHSA-m8vh-v6r6-w7p6https://github.com/getgrav/grav/security/advisories/GHSA-m8vh-v6r6-w7p6

    Common Weakness Enumeration

    CWE-248 Uncaught Exception

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High