CVE-2026-65603

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.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/getgrav/grav/security/advisories/GHSA-h33v-82r9-v8pm
https://www.vulncheck.com/advisories/grav-login-plugin-privilege-escalation-via-profile-update
https://github.com/getgrav/grav/security/advisories/GHSA-h33v-82r9-v8pm

Configurations

No configuration.

History

22 Jul 2026, 17:16

Type	Values Removed	Values Added
References	~~() https://github.com/getgrav/grav/security/advisories/GHSA-h33v-82r9-v8pm -~~	() https://github.com/getgrav/grav/security/advisories/GHSA-h33v-82r9-v8pm -

22 Jul 2026, 12:18

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-22 12:18

Updated : 2026-07-22 17:16

NVD link : CVE-2026-65603

Mitre link : CVE-2026-65603

CVE.ORG link : CVE-2026-65603

JSON object : View

Products Affected

No product.

CWE

CWE-269

Improper Privilege Management

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