What is CVE-2026-42608?

CVE-2026-42608 is a critical-severity vulnerability in Getgrav Grav, classified under Path Traversal. CVSS score: 9.1/10. Published 2026-05-11.

How severe is CVE-2026-42608?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Path Traversal in Getgrav Grav

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…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.001 (30.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Getgrav Grav — versions < 2.0.0-beta.2, 2.0.0

Weakness classification (CWE)

CWE-22 — Path Traversal

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-42608?: CVE-2026-42608 is a critical-severity vulnerability in Getgrav Grav, classified under Path Traversal. CVSS score: 9.1/10. Published 2026-05-11.
How severe is CVE-2026-42608?: Critical severity. CVSS v3 base score is 9.1 out of 10.