High severity · published Jul 17, 2026
CVE-2026-62386
Grav < 1.0.0-rc.16 Authentication Bypass via token URL Parameter
7.5
CVSS
0.3%
EPSS
No
On KEV
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.
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)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
grav · getgrav
before 1.0.0-rc.16 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-62386
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-62386
github.com
https://github.com/getgrav/grav/security/advisories/GHSA-4hpj-wmpw-ghwq
www.vulncheck.com
https://www.vulncheck.com/advisories/grav-rc-16-authentication-bypass-via-token-url-parameter
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