Which versions of Grav are affected by CVE-2026-65603?

Grav CMS Login plugin versions 3.8.11 and earlier contain a privilege escalation vulnerability that allows authenticated users to promote their own accounts to super-admin status.. A patch is available.

How to fix or mitigate CVE-2026-65603?

Within 24 hours: inventory all systems running grav-plugin-login <= 3.8.11 and map which instances permit low-privilege user self-registration or profile updates. Within 7 days: restrict access to the user profile update endpoint (update_user task) at the application or network layer to administrative users only, or disable user self-profile editing entirely if business process allows. Within 30 days: prepare and test an upgrade path; monitor the Grav plugin marketplace and vendor advisories for patch release, and schedule deployment to a patched version as soon as available.

Grav CVE-2026-65603

Q: What is the CVSS score of CVE-2026-65603?

CVE-2026-65603 has a CVSS 4.0 base score of 8.7 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.4%.

EUVD-2026-47647 HIGH

Improper Privilege Management (CWE-269)

2026-07-22 VulnCheck

GHSA-38mm-mxvc-j98q

Privilege Escalation Grav

8.7

CVSS 4.0 · Vendor: VulnCheck

Severity by source

Vendor (VulnCheck) PRIMARY

8.7 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (VulnCheck) · only source for this CVE.

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Patch available

Jul 22, 2026 - 13:02 EUVD

Analysis Generated

Jul 22, 2026 - 12:21 vuln.today

CVE Published

Jul 22, 2026 - 11:21 cve.org

HIGH 8.7

DescriptionCVE.org

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.

AnalysisAI

Privilege escalation in the Grav CMS Login plugin (grav-plugin-login) <= 3.8.11 lets a low-privilege authenticated user promote their own account to super-admin by injecting privilege fields into a profile self-update request. The flaw lives in processUserProfile() (the update_user task), which — unlike the registration handler — fails to strip 'groups' and 'access' from user-submitted form data before persisting it. …

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Within 24 hours: inventory all systems running grav-plugin-login <= 3.8.11 and map which instances permit low-privilege user self-registration or profile updates. …

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