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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.

PUBLISHED Reserved 2026-07-01 | Published 2026-07-08 | Updated 2026-07-08 | Assigner VulnCheck




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

Problem types

Use of GET Request Method With Sensitive Query Strings

Product status

Default status
unaffected

Any version
affected

Credits

nicl4ssic reporter

References

github.com/...v/grav/security/advisories/GHSA-hqm9-5xxw-4qxp exploit

github.com/...v/grav/security/advisories/GHSA-hqm9-5xxw-4qxp (GitHub Security Advisory (GHSA-hqm9-5xxw-4qxp)) vendor-advisory

www.vulncheck.com/...a-cors-wildcard-and-jwt-query-parameter (VulnCheck Advisory: Grav API Plugin - Cross-Origin Admin Account Takeover via CORS Wildcard and JWT Query Parameter) third-party-advisory

cve.org (CVE-2026-58656)

nvd.nist.gov (CVE-2026-58656)

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