What’s Vulnerable › Vulnerabilities

CVE-2026-62386: Grav < 1.0.0-rc.16 Authentication Bypass via token URL Parameter

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-17 · updated 2026-10-24
• Weakness: CWE-598

Description

The Grav API plugin (getgrav/grav-plugin-api) before 1.0.0-rc.16 accepts JWT access tokens through the ?token= URL query parameter on every API route (JwtAuthenticator::extractBearerToken fallback). Because tokens are embedded in URLs, they are logged verbatim in web server access logs, leaked via the Referer header, stored in browser history, and captured by upstream proxy and CDN logs, exposing valid admin access tokens. A leaked token grants unauthorized API access, including reading configuration and user data, creating admin accounts, modifying system settings, and deleting pages.

Affected products

• getgrav grav: before 1.0.0-rc.16 — fixed in 1.0.0-rc.16

How to fix

Upgrade to a fixed version: getgrav grav 1.0.0-rc.16. Check the vendor advisory for mitigations.

References

• https://github.com/getgrav/grav/security/advisories/GHSA-4hpj-wmpw-ghwq
• https://www.vulncheck.com/advisories/grav-rc-16-authentication-bypass-via-token-url-parameter
• https://github.com/getgrav/grav/security/advisories/GHSA-4hpj-wmpw-ghwq

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