CVE-2026-58656

EUVD-2026-42266

08.07.2026, 14:17

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	7.5 HIGH	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Awaiting analysis

This vulnerability is currently awaiting analysis.

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Common Weakness Enumeration

CWE-598 - Use of GET Request Method With Sensitive Query Strings
The web application uses the HTTP GET method to process a request and includes sensitive information in the query string of that request.

References

https://github.com/getgrav/grav/security/advisories/GHSA-hqm9-5xxw-4qxp

https://www.vulncheck.com/advisories/grav-api-plugin-cross-origin-admin-account-takeover-via-cors-wildcard-and-jwt-query-parameter

https://github.com/getgrav/grav/security/advisories/GHSA-hqm9-5xxw-4qxp