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CVE-2026-42843

33
FAUCET Score

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.

First published: May 11, 2026Last modified: May 11, 2026

Impacted Technologies

VendorProductVersion(s)CPE
1.0.0CPE matchmatch criteria
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta1:*:*:*:*:*:*
1.0.0CPE matchmatch criteria
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta10:*:*:*:*:*:*
1.0.0CPE matchmatch criteria
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta11:*:*:*:*:*:*
1.0.0CPE matchmatch criteria
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta12:*:*:*:*:*:*
1.0.0CPE matchmatch criteria
cpe:2.3:a:getgrav:grav-plugin-api:1.0.0:beta13:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.35%
Probability of exploitation in next 30 days
EPSS Percentile
27.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0035 is in the 15th percentile among its peer group of 17,823 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

composerpatch availablevia ghsa
Product: getgrav/grav-plugin-apiFixed in: 1.0.0-beta.15
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-r945-h4vm-h736high

Grav API Privilege Escalation to Super Admin

May 5, 2026

References

github.com / getgrav/grav/security/advisories/GHSA-r945-h4vm-h736
ExploitVendor Advisory