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CVE-2026-42608

8.8 high SSVC exploitation: poc Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 2

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 8.8 · getgravNVD modified 2026-10-26 18:10

Affected (CPE criteria) 2

  • cpe:2.3:a:getgrav:grav:*:*:*:*:*:*:*:*
  • cpe:2.3:a:getgrav:grav:2.0.0:beta1:*:*:*:*:*:*

References 2