CVE-2026-42609
Grav: Administrative Account Disruption and Privilege De-escalation via User Overwrite Logic
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
| NVDNVD · Modified | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.46% · top 60% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.1.
Weakness
- CWE-269: Improper Privilege Management (opens in a new tab)All about CWE-269 and its CVEs
- CWE-285: Improper Authorization (opens in a new tab)All about CWE-285 and its CVEs
- CWE-639: Authorization Bypass Through User-Controlled Key (opens in a new tab)All about CWE-639 and its CVEs
- CWE-837: Improper Enforcement of a Single, Unique Action (opens in a new tab)All about CWE-837 and its CVEs
Affected products
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Packagistgetgrav/gravGHSA-rr73-568v-28f8 (opens in a new tab)
References (4)
- https://github.com/getgrav/grav/security/advisories/GHSA-rr73-568v-28f8 (opens in a new tab)x_refsource_CONFIRMexploit
- https://github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663 (opens in a new tab)x_refsource_MISC
- https://github.com/getgrav/grav/commit/c66dfeb5ff679a1667678c6335eb9ff3255dfc47 (opens in a new tab)x_refsource_MISC
- https://github.com/getgrav/grav/commit/d904efc33e03ebb597afde8d3368b28cf0423632 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-rr73-568v-28f8 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-42609)Record last updated .