CVE-2026-42608CRITICAL 9.1EPSS p40.1%

CVE-2026-42608CVE-2026-42608

Description

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.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS0.52% probability of exploitation · percentile 40.1% · 2026-06-18T12:00:27Z
Published2026-05-11
Last modified2026-05-13

Underlying weaknesses· 1

CWE-22

References

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

1

TypeTargetConfidenceTier
WeaknessImproper Limitation of a Pathname to a Restricted Directory ('Path Traversal')cwe-220%live

Related by meaning· 6

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.