CVE-2026-58656

Grav API Plugin - Cross-Origin Admin Account Takeover via CORS Wildcard and JWT Query Parameter

State: Published
Severity: 8.7 High
Published: Jul 8, 2026
Updated: Jul 8, 2026
Reserved: Jul 1, 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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	VulnCheck

Weaknesses

CWE-598 Use of GET Request Method With Sensitive Query Strings

Affected Products

Product	Versions
gravgetgrav	1.0.0-rc.15 and earlierAffected

References

GitHub Security Advisory (GHSA-hqm9-5xxw-4qxp)vendor-advisory
VulnCheck Advisory: Grav API Plugin - Cross-Origin Admin Account Takeover via CORS Wildcard and JWT Query Parameterthird-party-advisory

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