Grav vulnerable to Privilege Escalation in Grav Admin: Missing Username Uniqueness Check Allows Admin Account Takeover
Summary
| CVE | CVE-2025-66296 |
|---|---|
| State | PUBLISHED |
| Assigner | GitHub_M |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2025-12-01 21:15:53 UTC |
| Updated | 2026-09-26 00:10:00 UTC |
| Description | Grav is a file-based Web platform. Prior to 1.8.0-beta.27, a privilege escalation vulnerability exists in Grav’s Admin plugin due to the absence of username uniqueness validation when creating users. A user with the create user permission can create a new account using the same username as an existing administrator account, set a new password/email, and then log in as that administrator. This effectively allows privilege escalation from limited user-manager permissions to full administrator access. This vulnerability is fixed in 1.8.0-beta.27. |
Risk And Classification
Primary CVSS: v3.1 8.8 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.003180000 probability, percentile 0.222120000 (date 2026-09-27)
Problem Types: CWE-266 | CWE-266 CWE-266: Incorrect Privilege Assignment
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 8.8 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | DECLARED | 8.8 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Getgrav | Grav | All | All | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta1 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta10 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta11 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta12 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta13 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta14 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta15 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta16 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta17 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta18 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta19 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta2 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta20 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta21 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta22 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta23 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta24 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta25 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta26 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta3 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta4 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta5 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta6 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta7 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta8 | All | All |
| Application | Getgrav | Grav | 1.8.0 | beta9 | All | All |
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/getgrav/grav/commit/3462d94d575064601689b236508c316242e15741 | [email protected] | github.com | Patch |
| github.com/getgrav/grav/security/advisories/GHSA-cjcp-qxvg-4rjm | [email protected] | github.com | Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.