CVE-2025-66296 json
Grav vulnerable to Privilege Escalation in Grav Admin: Missing Username Uniqueness Check Allows Admin Account Takeover
published 2025-12-01 11 mo ago modified 2026-09-26 44 d ago also EUVD-2025-200079 , GHSA-cjcp-qxvg-4rjm
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 27%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- packagist getgrav/grav 1.8.0-beta.27
- getgrav grav 1.8.0-beta.27
- getgrav grav_cms 1.8.0-beta.27
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 11 mo ago
Exploit prediction
0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | getgrav/grav | <1.8.0-beta.27 |
1.8.0-beta.27 |
Affected products
- getgrav grav
Classification
- Weakness
-
- CWE-266 Incorrect Privilege Assignment
References
-
github.com
/getgrav/grav/commit/3462d94d575064601689b236508c316242e15741
web, patch
-
github.com
/getgrav/grav/security/advisories/GHSA-cjcp-qxvg-4rjm
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-66296
advisory
-
github.com
/getgrav/grav
package
Sources
- CVE List CVE-2025-66296
- GitHub Advisory GHSA-cjcp-qxvg-4rjm
- NVD CVE-2025-66296
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.