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

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Summary

CVECVE-2026-42609
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-11 16:17:33 UTC
Updated2026-05-12 16:16:54 UTC
DescriptionGrav 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from [email protected]

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

Problem Types: CWE-269 | CWE-285 | CWE-639 | CWE-837 | CWE-269 CWE-269: Improper Privilege Management | CWE-285 CWE-285: Improper Authorization | CWE-639 CWE-639: Authorization Bypass Through User-Controlled Key | CWE-837 CWE-837: Improper Enforcement of a Single, Unique Action

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Getgrav Grav 2.0.0 beta1 All All
Application Getgrav Grav All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Getgrav Grav affected < 2.0.0-beta.2 Not specified

References

ReferenceSourceLinkTags
github.com/getgrav/grav/commit/d904efc33e03ebb597afde8d3368b28cf0423632 [email protected] github.com Patch
github.com/getgrav/grav/security/advisories/GHSA-rr73-568v-28f8 [email protected] github.com Exploit, Patch, Vendor Advisory
github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663 [email protected] github.com Patch
github.com/getgrav/grav/commit/c66dfeb5ff679a1667678c6335eb9ff3255dfc47 [email protected] github.com Patch
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