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    CVE-2026-42608

    Grav is a file-based Web platform. Prior to 2.0.0-beta.2, there is a Path Traversal vulnerability within the FormFlash core component. By manipulating the session_id (passed as __form-flash-id in POST requests), an unauthenticated attacker can traverse the filesystem to create arbitrary directories and write an index.yaml file containing attacker-controlled data. This vulnerability can lead to unauthorized modification of application behavior, potential data integrity issues, and service disruption in production environments. This vulnerability is fixed in 2.0.0-beta.2.

    Published:May 11, 2026
    Last Modified:May 13, 2026
    EPS:May 11, 2026
    EPSS Score:0.00099
    CVSS Score:9.1

    Affected Products

    Vendor
    Getgrav
    Product
    Grav

    Exploits

    https://github.com/getgrav/grav/security/advisories/GHSA-hmcx-ch82-3fv2https://github.com/getgrav/grav/security/advisories/GHSA-hmcx-ch82-3fv2

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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