Vulnerability · Published Jul 22, 2026 · Assigned by VulnCheck

CVE-2026-65603Grav Login Plugin 3.8.11 Privilege Escalation via Profile Update

High 8.8

In plain English

A high-severity privilege mismanagement in grav from getgrav. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.4%top 67.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

The Grav Login plugin (grav-plugin-login) versions <= 3.8.11 contain a privilege escalation flaw in the authenticated profile self-update handler (processUserProfile(), the update_user task). Unlike the registration handler, this handler does not strip privilege fields ('groups','access') from user-submitted form data before persisting them. When an administrator has added 'groups' and/or 'access' to plugins.login.user_registration.fields and the default 'regular'/DataUser account backend is in use, a low-privilege authenticated user can POST crafted profile form data (e.g. access[admin][super]=true) to escalate to super-admin, enabling admin panel access, scheduler abuse (RCE), and Twig evaluation. Fixed in 3.8.12.

Affected products (as reported)

Vendor	Product	Versions
getgrav	grav	0 – before 3.8.12

Weakness: CWE-269 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-h33v-82r9-v8pm) vendor-advisory
VulnCheck Advisory: Grav Login Plugin 3.8.11 Privilege Escalation via Profile Update third-party-advisory