CVE-2026-48488: phpMyFAQ Information Disclosure Flaw

CVE-2026-48488 Overview

CVE-2026-48488 affects phpMyFAQ, an open source FAQ web application. Versions prior to 4.1.4 hash attachment passwords using SHA-1, a cryptographically broken algorithm. SHA-1 has been vulnerable to collision attacks since the 2017 SHAttered research, making it unsuitable for password protection.

The weakness is tracked as CWE-328: Use of Weak Hash. Version 4.1.4 remediates the issue by replacing SHA-1 with a stronger hashing approach. The flaw allows an attacker who obtains hashed attachment passwords to recover the original values through collision or brute-force techniques against fast SHA-1 computations.

Critical Impact
Attachment password hashes generated with SHA-1 can be reversed or forged, exposing protected FAQ attachments to unauthorized disclosure.

Affected Products

phpMyFAQ versions prior to 4.1.4
Self-hosted phpMyFAQ deployments using attachment password protection
Fixed in phpMyFAQ 4.1.4

Discovery Timeline

2026-06-08 - CVE-2026-48488 published to NVD
2026-06-09 - Last updated in NVD database

Technical Details for CVE-2026-48488

Vulnerability Analysis

phpMyFAQ allows administrators to protect file attachments with passwords. In versions before 4.1.4, the application stored these passwords as SHA-1 digests. SHA-1 is a fast, general-purpose hash function not designed for password storage and is considered cryptographically broken.

The SHAttered research published by Google and CWI Amsterdam in 2017 demonstrated practical collision generation against SHA-1. SHA-1 also lacks salting, work factor tuning, and memory hardness — the properties required of modern password hashes such as bcrypt, scrypt, or Argon2.

An attacker who obtains the hash database can run high-throughput dictionary or brute-force attacks using commodity GPUs. Rainbow tables and precomputed SHA-1 datasets further reduce recovery time for common passwords. The result is unauthorized access to attachments intended to remain restricted.

Root Cause

The root cause is the use of a deprecated cryptographic primitive for password storage. The implementation called SHA-1 directly rather than a purpose-built password hashing function with salt and configurable cost. This falls within [CWE-328: Use of Weak Hash].

Attack Vector

Exploitation requires the attacker to first obtain the stored SHA-1 hashes, typically through database compromise, backup exposure, or a separate disclosure flaw. Once obtained, hashes can be cracked offline. The CVSS vector identifies the attack vector as network with no privileges or user interaction required, but the practical impact is limited to confidentiality of attachment passwords.

No verified public exploit code is associated with this CVE. The vulnerability is described in prose only — see the phpMyFAQ Security Advisory GHSA-58fg-62fg-3fcj for vendor details.

Detection Methods for CVE-2026-48488

Indicators of Compromise

Presence of 40-character hexadecimal hash values in phpMyFAQ attachment password fields, indicating SHA-1 storage
phpMyFAQ installation reporting a version string below 4.1.4 in the admin interface or version.php
Unexpected access events to password-protected attachments without corresponding authentication logs

Detection Strategies

Inventory phpMyFAQ deployments and compare installed versions against the fixed release 4.1.4
Review database schema and stored attachment password values for SHA-1-style digests
Correlate web access logs for repeated requests to attachment download endpoints that may indicate offline-cracked credential reuse

Monitoring Recommendations

Enable application logging for attachment access and authentication events in phpMyFAQ
Forward web server and application logs to a centralized analytics or SIEM platform for query and alerting
Alert on bulk downloads of attachment files or repeated failed password attempts against the attachment subsystem

How to Mitigate CVE-2026-48488

Immediate Actions Required

Upgrade phpMyFAQ to version 4.1.4 or later as the primary remediation
Force reset of all existing attachment passwords so they are re-hashed under the new algorithm
Audit database backups that may contain SHA-1 hashes and rotate any credentials reused elsewhere

Patch Information

The maintainers fixed the issue in phpMyFAQ 4.1.4. Review the upstream commit 1aa9be6 and the GHSA-58fg-62fg-3fcj advisory for change details. Apply the update through standard package management or by replacing the application files with the released version.

Workarounds

Restrict database and backup access so attachment password hashes cannot be exfiltrated
Place the phpMyFAQ administrative interface behind network access controls or a VPN until patched
Avoid reusing attachment passwords across systems to limit impact if hashes are recovered

bash

# Verify the installed phpMyFAQ version meets the fixed release
grep -R "VERSION" /var/www/phpmyfaq/version.php

# Upgrade workflow (illustrative)
cd /var/www
wget https://github.com/thorsten/phpMyFAQ/releases/download/4.1.4/phpMyFAQ-4.1.4.zip
unzip phpMyFAQ-4.1.4.zip -d phpmyfaq-new
# Follow upstream upgrade documentation before swapping directories