Vulnerability · Published May 11, 2026 · Assigned by GitHub_M

CVE-2026-42609Grav: Administrative Account Disruption and Privilege De-escalation via User Overwrite Logic

High 8.1

In plain English

A high-severity privilege mismanagement in grav from getgrav. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.5%top 59.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Grav is a file-based Web platform. Prior to 2.0.0-beta.2, a business logic vulnerability in the Grav Admin Panel allows a low-privileged user (with only user creation permissions) to overwrite existing accounts, including the primary administrator. By creating a new user with a username that already exists, the system updates the existing account's metadata and permissions instead of rejecting the request. This leads to a Denial of Service (DoS) on administrative functions and Privilege De-escalation of the root account. This vulnerability is fixed in 2.0.0-beta.2.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	getgrav/grav	2.0.0-beta.2	GHSA-rr73-568v-28f8

Affected products (as reported)

Vendor	Product	Versions
getgrav	grav	< 2.0.0-beta.2

Weakness: CWE-269, CWE-285, CWE-639, CWE-837 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

References

https://github.com/getgrav/grav/security/advisories/GHSA-rr73-568v-28f8 x_refsource_CONFIRM
https://github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663 x_refsource_MISC
https://github.com/getgrav/grav/commit/c66dfeb5ff679a1667678c6335eb9ff3255dfc47 x_refsource_MISC
https://github.com/getgrav/grav/commit/d904efc33e03ebb597afde8d3368b28cf0423632 x_refsource_MISC