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GroupController EUVDEUVD-2026-49332

| CVE-2026-66399 HIGH
Improper Privilege Management (CWE-269)
2026-07-27 disclosure@vulncheck.com GHSA-5w7v-f8fx-865c
8.5
CVSS 4.0 · Vendor: vulncheck
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Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V8 - Authorization Least privilege enforcement
MITRE ATT&CK

1 technique across 1 tactic: Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 27, 2026

Privilege escalation in phpMyFAQ before 4.1.6 allows administrators with only group-management permissions to add themselves to existing groups holding user-management rights without verification of required privileges, enabling unauthorized modification or deletion of user accounts. The vulnerability stems from missing authorization checks in GroupController::updateMembers(). No public exploit or active exploitation has been identified at the time of analysis.

Affected VersionsENISA

phpMyFAQ 0 <4.1.6

Affected Packages

euvd phpmyfaq fix: 4.1.6

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (vulncheck) PRIMARY 8.5 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (vulncheck) · only source for this CVE.

CVSS VectorVendor: vulncheck

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
High
User Interaction
None
Vulnerable system: Confidentiality
High
Vulnerable system: Integrity
High
Vulnerable system: Availability
None
Subsequent system: Confidentiality
None
Subsequent system: Integrity
None
Subsequent system: Availability
None

Lifecycle Timeline

2
Patch available
Jul 27, 2026 - 17:02 EUVD
CVE Published
Jul 27, 2026 - 16:18 cve.org
HIGH 8.5

DescriptionCVE.org

phpMyFAQ before 4.1.6 contains a privilege escalation vulnerability in GroupController::updateMembers() that allows administrators with only group-management permissions to join privileged groups without verification of required rights. Attackers can add themselves to pre-existing groups holding user-management rights and immediately inherit those permissions to modify or delete user accounts.

Executive ViewAI

Why It Matters

A privilege escalation vulnerability in phpMyFAQ versions before 4.1.6 allows administrators with only group-management permissions to improperly escalate their access by adding themselves to groups with user-management rights. This could lead to unauthorized modification or deletion of user accounts, impacting the integrity of user data and organizational trust. Leadership should ensure immediate review of administrative privileges and implement monitoring controls until a patch is available.

Recommended Action

Within 24 hours, restrict group-management administrator permissions to only trusted personnel and enable logging of all group membership changes. Within 7 days, conduct a full audit of existing administrative accounts and group memberships, and implement role-based access controls to enforce separation of duties. Within 30 days, if no vendor patch is available, consider deploying additional manual approval workflows for any group membership modifications, or isolate phpMyFAQ instances with higher security requirements.

Business Impact: High
Compensating Controls

If no vendor patch is available, restrict administrative access to only necessary personnel, enable detailed audit logging for group membership changes, and implement manual approval processes for any modifications to group assignments. Additionally, use network segmentation to limit exposure of the phpMyFAQ application and apply principle of least privilege to all administrator roles.

Threat Intelligence Overview

EPSS Score
0.2%
Top 86% exploitable
Data Quality
6 sources
Confidence: High

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.2%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision
Scheduled
Exploitation
Poc
System Exposure· derived
Open
Automatable
No
Human Impact
High
Technical Impact
Total

Priority Score

42
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +42
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.

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