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CVE-2026-42613

CriticalPublished

Grav: Privilege Escalation via Missing Server-Side Validation of groups/access

Published: May 11, 2026
Updated: May 12, 2026
Assigning CNA: GitHub_M
Evidence observed: Sep 10, 2026

Primary CVSS

9.4/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

EPSS probability estimate

0.9%

Low · next 30 days

Percentile: 58.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Grav is a file-based Web platform. Prior to 2.0.0-beta.2, the Login::register() method in the Login plugin accepts attacker-controlled groups and access fields from the registration POST data without server-side validation. When registration is enabled and groups or access are included in the configured allowed fields list, an unauthenticated user can self-register with admin.super privileges by injecting these fields into the registration request. This vulnerability is fixed in 2.0.0-beta.2.

Sources

CVE-2026-42613PoC
PHP proof-of-concept for CVE-2026-42613, demonstrating exploitation of the referenced vulnerability.

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