CVE-2026-65603

Summary

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 Software

Weaknesses

• CWE-269: Improper Privilege Management

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

Additional References

• https://github.com/getgrav/grav/security/advisories/GHSA-h33v-82r9-v8pm

References

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

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