Vulnerability · Published Aug 19, 2026 · Assigned by GitHub_M

CVE-2026-63408Grav API Plugin: JWT Access Token Accepted via `?token=` URL Query Parameter

High 7.5

In plain English

A high-severity security flaw in grav-plugin-api from getgrav. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.5%top 57.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Grav API Plugin is a RESTful API for Grav CMS that provides full headless access to your site's content. Prior to 1.0.0-rc.16, the Grav API plugin JwtAuthenticator::extractBearerToken() accepts a JWT from the token URL query parameter on every /api/v1 route, including state-changing endpoints. Request URLs consequently expose valid access tokens through Apache, proxy, and CDN logs, browser history, and Referer headers, allowing a party with access to those records to reuse the token with the owner's API privileges. This issue is fixed in version 1.0.0-rc.16.

Affected products (as reported)

Vendor	Product	Versions
getgrav	grav-plugin-api	< 1.0.0-rc.16

Weakness: CWE-598 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

https://github.com/getgrav/grav/security/advisories/GHSA-4hpj-wmpw-ghwq x_refsource_CONFIRM
https://github.com/getgrav/grav-plugin-api/commit/56ae2ca3bf36c8299a4b3d376c6a20e8c0ed5ba9 x_refsource_MISC
https://github.com/getgrav/grav-plugin-api/releases/tag/1.0.0-rc.16 x_refsource_MISC