What is the CVSS score of CVE-2025-66296?

CVE-2025-66296 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Grav are affected by CVE-2025-66296?

A privilege escalation vulnerability in Grav's Admin plugin allows users with limited permissions to create duplicate administrator accounts and gain full system access.. A patch is available.

How to fix or mitigate CVE-2025-66296?

Within 24 hours: Audit all user accounts in Grav Admin for duplicate usernames, particularly administrator accounts, and document findings. Within 7 days: Upgrade Grav to version 1.8.0-beta.27 or later on all affected instances. Within 30 days: Conduct a comprehensive access review, reset credentials for all administrator accounts, and review audit logs for unauthorized account creation or privilege escalation attempts.

Grav CVE-2025-66296

EUVD-2025-200079 HIGH

Incorrect Privilege Assignment (CWE-266)

2025-12-01 security-advisories@github.com

GHSA-cjcp-qxvg-4rjm

Privilege Escalation Grav

8.8

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

8.8 HIGH

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

EUVD ID Assigned

Mar 15, 2026 - 13:34 euvd

EUVD-2025-200079

Analysis Generated

Mar 15, 2026 - 13:34 vuln.today

Patch released

Mar 15, 2026 - 13:34 nvd

Patch available

CVE Published

Dec 01, 2025 - 21:15 nvd

HIGH 8.8

DescriptionGitHub Advisory

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.

Analysis

Technical ContextAI

Privilege escalation allows a low-privileged user or process to gain elevated permissions beyond what was originally authorized.

RemediationAI

A vendor patch is available — apply it immediately. Apply the principle of least privilege. Keep systems patched. Monitor for suspicious privilege changes. Use mandatory access controls (SELinux, AppArmor).