CVE-2026-42608: Getgrav Grav

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

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 modified2026-06-17

Timeline

2026-05-11Published to the U.S. National Vulnerability Database (NVD)
2026-06-17NVD record last updated
2026-09-26First covered in a defend.network daily briefing

Affected product

Getgrav Grav

References

Referenced in our briefings & reports

GitHub Actions re-compromised; North Korea suspected in $351M Bitget heist (2026-09-26)

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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.

What is CVE-2026-42608?

Timeline

Affected product

References

Referenced in our briefings & reports

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