How should we interpret CVSS severity scores?

CVSS estimates technical severity, but it does not automatically equal business risk. Prioritize using context like internet exposure, asset criticality, known exploitation, and whether compensating controls exist. A Medium CVSS on an exposed production system can be more urgent than a Critical on an isolated non-production host.

Vulnerability Database

Q: What is a Vulnerability (CVE) and why does it matter?

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

Q: What's the difference between a vulnerability, an exploit, and a zero-day?

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. Risk increases sharply when exploitation becomes reliable or widespread.

Q: Why do vulnerabilities keep reappearing in our environment?

Recurring findings usually come from incomplete asset discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host.

Q: How do we prioritize remediation without burning out the team?

Use a repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress so remediation is steady, not reactive.

Q: How can SynScan help reduce vulnerability risk over time?

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.

390,645

Total vulnerabilities in the database

phpMyFAQ has Potential Authenticated Path Traversal in PDF Export — thorsten / phpmyfaq

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Summary

There is an authenticated path traversal condition in the PDF export functionality, specifically within the PDF image resolution logic.

The issue may allow a privileged FAQ editor to cause the application to attempt reading files outside the intended content directory during PDF generation.

Affected Component

File: src/phpMyFAQ/Export/Pdf/Wrapper.php

Function: concatenatePaths()

Root Cause

The path resolution logic relies on locating the substring "content" within a user-controlled path:

$pos = strpos($trimmedFile, &#039;content&#039;);
$relativePath = substr($trimmedFile, (int) $pos);

If "content" is not present, strpos() returns false, which becomes 0 when cast to an integer.

As a result, the entire attacker-controlled path is preserved.

Example:

$trimmedFile = &quot;../../../etc/passwd&quot;;
$pos = false;
$relativePath = &quot;../../../etc/passwd&quot;;

The resulting path is later processed by:

file_get_contents($resolvedPath);

without canonicalization or a root-directory containment check.

Observed Data Flow

FAQ Content
    -&gt;
PDF Export
    -&gt;
WriteHTML()
    -&gt;
Wrapper::Image()
    -&gt;
concatenatePaths()
    -&gt;
file_get_contents()

Potential Impact

Based on code review, a user with FAQ editing privileges may be able to store HTML containing crafted image paths that are processed during PDF generation.

Potential consequences may include:

Path traversal outside the intended content directory
Local file read attempts during PDF export
Possible disclosure of readable files depending on file type, sanitization behavior, and PDF rendering constraints

Discovery Method

This issue was initially detected by an internally developed SAST tool during analysis of the phpMyFAQ source code.

The finding was then manually investigated and validated through code review.

While the original scanner output classified the issue as a generic path traversal/local file inclusion pattern, manual analysis identified the specific root cause in the path resolution logic of concatenatePaths().

Potential Exploitation Scenario

The following scenario is based on code review and intended to illustrate the potential impact:

A user with FAQ editing privileges creates or modifies a FAQ entry.
The FAQ content contains an HTML image tag with a crafted relative path that does not include the expected content directory reference.
The HTML content is stored and later processed by the PDF export functionality.
When a user requests the PDF version of the FAQ, the application invokes WriteHTML(), which eventually reaches Wrapper::Image().
concatenatePaths() constructs a filesystem path without canonicalization or directory containment validation.
The resulting path reaches file_get_contents(), causing the application to attempt reading a file outside the intended content directory.
Depending on sanitization behavior, file permissions, image validation, and PDF rendering behavior, the contents of the targeted file may potentially be exposed to the PDF consumer.

Based on my current analysis, exploitation would require a user capable of editing FAQ content and is therefore not considered an anonymous or unauthenticated attack vector.

Suggested Remediation

Consider replacing substring-based path anchoring with:

realpath() canonicalization
Strict root-directory containment checks
Explicit allowlisting of permitted image locations

Published: Aug 25, 2026
Updated: Aug 26, 2026
GHSA: GHSA-88g4-74f3-63x9
Severity: Medium
Exploit:
CISA KEV:

CVSS v3:

Severity: Medium
Score: 4.9
AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

CWEs:

CWE-22

OWASP TOP 10:

A5 - Broken Access Control

Affected Software
References

Software	Affected versions
thorsten / phpmyfaq	`>= 4.0.0-alpha, < 4.1.5`
phpmyfaq / phpmyfaq	`>= 4.0.0-alpha, < 4.1.5`

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Frequently Asked Questions

What is a Vulnerability (CVE) and why does it matter?

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.