High severity · published Aug 19, 2026
CVE-2026-63408
Grav API Plugin: JWT Access Token Accepted via `?token=` URL Query Parameter
7.5
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
grav-plugin-api · getgrav
< 1.0.0-rc.16 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63408
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-63408
github.com
https://github.com/getgrav/grav-plugin-api/commit/56ae2ca3bf36c8299a4b3d376c6a20e8c0ed5ba9
github.com
https://github.com/getgrav/grav-plugin-api/releases/tag/1.0.0-rc.16
github.com
https://github.com/getgrav/grav/security/advisories/GHSA-4hpj-wmpw-ghwq
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