CVE-2026-58656

Summary

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.

Affected Software

Weaknesses

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

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

Additional References

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

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

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