CVE-2026-42843

Grav API Plugin is a RESTful API for Grav CMS that provides full headless access to your site's content, media, configuration, users, and system management. Prior to 1.0.0-beta.15, an insecure direct object reference and logic flaw in the Grav API plugin (UsersController::update) allows any authenticated user with basic API access (api.access) to modify their own permission configuration. An attacker can exploit this to escalate their privileges to Super Administrator (admin.super and api.super), leading to full system compromise and potential RCE. This vulnerability is fixed in 1.0.0-beta.15.

CVSS v3.1

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

CVSS v3.1

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

EPSS

0.35% chance of exploitation in the next 30 days, 28th percentile

Published

2026-05-11

Proof-of-concept exploits (1)

• advisories/GHSA-r945-h4vm-h736

References

• CVE Record
• NVD entry

Related

• CVE-2026-42841
• CVE-2026-42844
• CVE-2026-4284
• CVE-2026-42845
• CVE-2026-42826
• CVE-2026-4285