What is CVE-2026-58656?

CVE-2026-58656 is a high-severity vulnerability in Getgrav Grav, classified under CWE-598. CVSS score: 7.5/10. Published 2026-07-08.

How severe is CVE-2026-58656?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Getgrav Grav

CVE-2026-58656

Grav API plugin before v1.0.0-rc.16 accepts JWT tokens via the ?token= URL query parameter and responds with Access-Control-Allow-Origin: *, allowing unauthenticated attackers to make fully authenticated cross-origin API requests from any malicious website. Attackers who obtain a leaked JWT token from access logs, proxy logs, browser history, or Referrer headers can create persistent backdoor super-admin accounts and exfiltrate sensitive configuration and user data.

EPSS: 0.003 (19.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Getgrav Grav — versions 0

Weakness classification (CWE)

CWE-598

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-58656?: CVE-2026-58656 is a high-severity vulnerability in Getgrav Grav, classified under CWE-598. CVSS score: 7.5/10. Published 2026-07-08.
How severe is CVE-2026-58656?: High severity. CVSS v3 base score is 7.5 out of 10.