CVE-2025-66296 | Grav vulnerable to Privilege Escalation in Grav Admin: Missing Username Uniqueness Check Allows Admin Account Takeover

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.

Published: 2025-12-01 Last update: 2025-12-04 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-66296 is rated Moderate Risk (40.7/100): CVSS High severity, with low exploitation likelihood (EPSS 0.05%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-66296

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-02-07 0.03% 0.05% +0.02%
2 2025-12-02 — 0.03% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-66296

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]

Weakness enumeration for CVE-2025-66296

GitHub Security Advisory for CVE-2025-66296

GHSA-cjcp-qxvg-4rjm · Severity: high · Ecosystem: composer — Grav vulnerable to Privilege Escalation in Grav Admin: Missing Username Uniqueness Check Allows Admin Account Takeover

Affected software / configurations for CVE-2025-66296

Vendor Product Version Raw CPE
getgrav grav >= 1.7.49.5, < 1.8.0 cpe:2.3:a:getgrav:grav:*:*:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta1:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta10:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta11:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta12:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta13:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta14:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta15:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta16:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta17:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta18:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta19:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta2:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta20:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta21:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta22:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta23:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta24:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta25:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta26:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta3:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta4:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta5:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta6:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta7:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta8:*:*:*:*:*:*
getgrav grav 1.8.0 cpe:2.3:a:getgrav:grav:1.8.0:beta9:*:*:*:*:*:*

References for CVE-2025-66296

cvelogic Threat Intelligence