CRITICALVulnerability
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NVD CRITICAL: CVE-2026-42608 — Grav is a file-based Web platform. Prior to 2.0.0-beta.2, there is a Path Traver...

·Source: NIST NVD

Updated:

Executive Summary

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 una

Analysis

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. CVSS Score: 9.1. Published: 2026-05-11T16:17:33.207.

Indicators of Compromise (1)

CVE (1)
CVE-2026-42608
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on May 11, 2026. Verified by: NIST.

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