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CVE-2026-42843

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

Published: May 11, 2026Updated: May 27, 2026 Sources: CVE List NVDCWE-863
NVD MITRE
8.8CVSSHIGH
EPSS Score
0.4%
Top 73.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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 Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-863

Affected Products

grav-plugin-apigetgrav
On-prem
Web & CMS Plugins / cms-core
getgravoss-projectWeb & CMS Pluginsaka grav, grav-plugin-admin, getgrav/grav

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://github.com/getgrav/grav/security/advisories/GHSA-r945-h4vm-h736
github.com

Timeline

Published
May 11, 2026
Last Updated
May 27, 2026

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