CVE-2026-62386 Grav < 1.0.0-rc.16 Authentication Bypass via token URL Parameter
Attackers can steal admin JWT tokens from logs or history due to URL exposure, enabling unauthorized API access and privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-62386?
CVE-2026-62386 is a high-severity vulnerability in getgrav grav, published on 17 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-598
Which versions are affected by CVE-2026-62386?
How do I fix CVE-2026-62386?
No fix has been published for CVE-2026-62386 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-62386 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-62386 exists.
Sources
Also known as GHSA-cx27-6j8x-h4h6.