Vulnerability · Published Jul 17, 2026 · Assigned by VulnCheck

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

High 7.5

In plain English

A high-severity security flaw in grav from getgrav. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.3%top 73.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
getgrav	grav	0 – before 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

GitHub Security Advisory (GHSA-4hpj-wmpw-ghwq) vendor-advisory
VulnCheck Advisory: Grav < 1.0.0-rc.16 Authentication Bypass via token URL Parameter third-party-advisory