CVE-2026-58656

HighCVSS 7.5/10Last modified Oct 25, 2026

Description

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-598

Affected software

Vendor	Product	Versions
getgrav	grav	<= 1.0.0-rc.15

References

Timeline

Published: Jul 8, 2026
Last modified: Oct 25, 2026
NVD status: Deferred

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