PatchSiren cyber security CVE debrief
CVE-2026-65603 getgrav CVE debrief
The Grav Login plugin (grav-plugin-login) versions <= 3.8.11 contains a high-severity privilege escalation vulnerability. The flaw exists in the authenticated profile self-update handler, which fails to strip privilege fields from user-submitted form data. This allows low-privilege authenticated users to escalate privileges to super-admin, potentially enabling admin panel access, scheduler abuse, and Twig evaluation. The vulnerability is fixed in version 3.8.12.
- Vendor
- getgrav
- Product
- grav
- CVSS
- HIGH 8.7
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-07-22
- Original CVE updated
- 2026-07-22
- Advisory published
- 2026-07-22
- Advisory updated
- 2026-07-22
Who should care
Administrators and users of Grav CMS with the Login plugin installed should be aware of this vulnerability. If the plugin is installed and not updated to version 3.8.12 or later, immediate action is required to prevent potential privilege escalation attacks.
Technical summary
The Grav Login plugin versions <= 3.8.11 has a privilege escalation vulnerability in the authenticated profile self-update handler (processUserProfile(), the update_user task). This handler does not properly 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 to escalate to super-admin. This could enable admin panel access, scheduler abuse (RCE), and Twig evaluation. The vulnerability is fixed in version 3.8.12.
Defensive priority
High
Recommended defensive actions
- Immediately update the Grav Login plugin to version 3.8.12 or later.
- Review and restrict user privileges within the Grav CMS admin panel.
- Monitor user account activity and profile updates.
- Implement additional security measures such as IP restrictions and two-factor authentication for admin accounts.
- Review compensating controls for exposed systems while remediation is scheduled and verified.
- Check relevant monitoring, detection, and logs for exposed assets that need extra review.
- Track exceptions, retest remediated assets, and close the item only after evidence is documented.
Evidence notes
The CVE record was published on 2026-07-22T12:18:20.683Z and was last modified on 2026-07-22T17:16:59.437Z. The NVD entry is currently Awaiting Analysis. References include vendor advisories and researcher reports.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-22T12:18:20.683Z and has not been modified since then. The NVD entry is currently Awaiting Analysis.