grav-plugin-api: Grav API Privilege Escalation to Super Admin

published 2026-05-05 6 mo ago modified 2026-10-26 13 d ago also GHSA-r945-h4vm-h736 , EUVD-2026-29128

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 28%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 links 1

packagist getgrav/grav-plugin-api 1.0.0-beta.15

github.com/getgrav/grav-plugin-api@26f529c commit

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 5 mo ago (2026-05-11)

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/getgrav/grav/security/advisories/GHSA-r945-h4vm-h736 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
GitHub	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
packagist	getgrav/grav-plugin-api	<1.0.0-beta.15	1.0.0-beta.15

Affected products

getgrav grav-plugin-api

Classification

Weakness

CWE-863 Incorrect Authorization

References

github.com /getgrav/grav-plugin-api/commit/26f529c7d438c73343e82311fb095caeaf1a6116
web
github.com /getgrav/grav/security/advisories/GHSA-r945-h4vm-h736
exploit, web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2026-42843
advisory
github.com /getgrav/grav
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary