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CVE-2026-42608

Getgrav Grav•CRITICAL · CVSS 9.1•No exploitation reported

What is 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.

CVSS9.1 NVD 3.1
SeverityCRITICAL
ExploitationNo exploitation reported
EPSS1% · P49
Triage statusNo Known Exploit
ActionPatch within 48 hours
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWECWE-22
NVD published2026-05-11
NVD last modified2026-10-26

Timeline

  • 2026-05-11Published to the U.S. National Vulnerability Database (NVD)
  • 2026-09-26First covered in a defend.network daily briefing
  • 2026-10-26NVD record last updated

Affected product

Getgrav Grav

References

Referenced in our briefings & reports

Related vulnerabilities

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🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.