What is the CVSS score of CVE-2026-66397?

CVE-2026-66397 has a CVSS 4.0 base score of 8.6 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. EPSS exploitation probability: 0.3%.

Is there a patch available for CVE-2026-66397?

Yes, a patch is available for CVE-2026-66397. Update the affected software to the latest version immediately.

PHP CVE-2026-66397

EUVD-2026-49330 HIGH

Path Traversal (CWE-22)

2026-07-27 disclosure@vulncheck.com

GHSA-4cv6-9jjm-xp2g

PHP Path Traversal

8.6

CVSS 4.0 · Vendor: vulncheck

View

Vulnerability Assessment

Weakness

CWE

CWE-22

OWASP Top 10:2025

A01:2025 - Broken Access Control

ASVS 5.0

V5 - File Handling Path canonicalization, traversal prevention

MITRE ATT&CK

2 techniques across 2 tactics: Discovery, Collection

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 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 28, 2026

Path traversal in phpMyFAQ's category image deletion allows authenticated attackers to delete arbitrary files, leading to superadmin account creation. Versions before 4.1.6 fail to sanitize the existing_image parameter, permitting deletion of critical files like database.php, which disables the installation gate and exposes the setup wizard. Publicly available exploit code exists, and the issue has been verified by the vendor.

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 8.6 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/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

High

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

Lifecycle Timeline

Patch available

Jul 27, 2026 - 17:02 EUVD

CVE Published

Jul 27, 2026 - 16:18 cve.org

HIGH 8.6

DescriptionCVE.org

phpMyFAQ before 4.1.6 fails to validate path traversal sequences in the existing_image field during category updates, allowing authenticated attackers to delete arbitrary files by exploiting insufficient sanitization in Image::delete(). Attackers can delete the database.php configuration file to disable the installation gate and access the public setup wizard to create new superadmin accounts.

Articles & Coverage 1

News 4 New PHP Vulnerabilities - 3 Critical, 2 With POC Jul 28, 2026

Threat Intelligence Overview

EPSS Score

0.3%

Top 75% exploitable

Data Quality

6 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

Vulnrichment

GitHub

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 0.3%

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· derived

Scheduled

Exploitation

Poc

System Exposure· derived

Open

Automatable

Human Impact· derived

Medium

Technical Impact

Total

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +43

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Path Traversal HIGH

Path traversal exploits occur when applications use user-controlled input to construct file system paths without proper validation.

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References

Advisories & patches

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-66397 REF https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-mh9w-5hr8-3272 REF https://www.vulncheck.com/advisories/phpmyfaq-before-path-traversal-via-category-image-deletion

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