getgrav Grav 1.0.0-beta.15/1.0.0-beta.17 Grav API extractBearerToken token improper authorization

Summaryinfo

A vulnerability labeled as critical has been found in getgrav Grav. Affected by this issue is the function extractBearerToken of the component Grav API. Executing a manipulation of the argument token can lead to improper authorization. This vulnerability is tracked as CVE-2026-62386. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in getgrav Grav and classified as critical. This vulnerability affects the function extractBearerToken of the component Grav API. The manipulation of the argument token with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-62386 since 07/14/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1548.002.

Upgrading to version 1.0.0-rc.16 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-45086). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• getgrav

Name

• Grav

Version

• 1.0.0-beta.15
• 1.0.0-beta.17

Website

• Product: https://github.com/getgrav/grav/

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Once again VulDB remains the best source for vulnerability data.

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