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How CVE-2026-48488 Works
phpMyFAQ is an open‑source FAQ web application widely used to manage knowledge bases and support content. Prior to version 4.1.4, the application stored attachment passwords using the SHA‑1 cryptographic hash function. SHA‑1 has been considered broken since 2017, when the SHAttered attack demonstrated that practical collision attacks are feasible with modest computational resources.
The vulnerability resides in the file phpmyfaq/src/phpMyFAQ/Attachment/AbstractAttachment.php, where the password hashing logic is implemented. When a user sets a password to protect an attachment, phpMyFAQ computes the SHA‑1 hash of that password and stores the resulting hash in the database. Because SHA‑1 is a fast, deterministic algorithm, an attacker who gains access to the stored hashes can attempt to reverse them using precomputed rainbow tables or brute‑force attacks. More critically, the collision resistance of SHA‑1 is broken: an attacker can craft two different inputs that produce the same hash output, potentially bypassing authentication without ever knowing the original password.
This cryptographic weakness directly maps to CWE‑327 (Use of a Broken or Risky Cryptographic Algorithm) and CWE‑328 (Use of a Weak Hash). The use of SHA‑1 violates modern cryptographic standards such as NIST Special Publication 800‑131A, which explicitly deprecates SHA‑1 for security‑sensitive applications.
Exploitation of this flaw does not require remote code execution; rather, it depends on the attacker’s ability to obtain the password hashes—for example, through a separate data breach, SQL injection, or insider access. Once the hashes are obtained, the attacker can leverage the weaknesses of SHA‑1 to recover passwords or generate collisions, thereby gaining unauthorized access to protected attachments. The vulnerability was officially published on June 8, 2026, and fixed in version 4.1.4.
DailyCVE Form
Platform: phpMyFAQ
Version: < 4.1.4
Vulnerability: Weak SHA‑1 hashing
Severity: Low (CVSS 2.7)
Date: 2026‑06‑08
Prediction: Patch expected 2026‑05‑25
What Undercode Say
Analytics & Detection Commands
To identify whether your phpMyFAQ instance is vulnerable, check the installed version:
Check phpMyFAQ version from the command line (if accessible) grep -i "version" /path/to/phpmyfaq/version.php Alternatively, query the database for the version table mysql -u username -p -e "SELECT FROM faqconfig WHERE config_key='version';"
To audit the hashing algorithm currently used for attachment passwords, inspect the database:
Dump the attachment password hashes (example for MySQL)
mysql -u username -p -e "SELECT id, filename, password FROM faqattachment;" | head -20
Identify hash length – SHA‑1 produces 40‑character hexadecimal strings
Check if any hash matches the SHA‑1 pattern (40 hex chars)
mysql -u username -p -e "SELECT id, filename, password FROM faqattachment WHERE password REGEXP '^[a-fA-F0-9]{40}$';"
For continuous monitoring, implement a log watch for unusual access to attachment endpoints:
Monitor web server logs for excessive attachment downloads tail -f /var/log/nginx/access.log | grep -i "attachment"
Exploit
An attacker who obtains the SHA‑1 hashes of attachment passwords can use off‑the‑shelf tools to crack them. For example, using `hashcat` with a dictionary or brute‑force attack:
Save the SHA‑1 hash to a file (e.g., hash.txt) echo "5baa61e4c9b93f3f0682250b6cf8331b7ee68fd8" > hash.txt Crack using hashcat with mode 100 (SHA‑1) hashcat -m 100 -a 0 hash.txt /usr/share/wordlists/rockyou.txt Or use John the Ripper john --format=raw-sha1 hash.txt
For collision attacks, an attacker with the hash can generate a second preimage using established techniques (e.g., the SHAttered method) to create a different password that yields the same SHA‑1 digest, thereby bypassing authentication without ever knowing the original password.
Protection
- Upgrade immediately – Update phpMyFAQ to version 4.1.4 or later, which replaces SHA‑1 with stronger algorithms such as SHA‑256 or SHA‑3.
- If upgrade is not possible – Delete all existing attachment password hashes and require users to set new, strong passwords.
- Temporary workaround – Disable attachment password protection until the upgrade can be completed.
- Implement additional controls – Enforce password complexity rules, enable account lockout policies, and conduct regular security audits.
- Monitor for anomalies – Review access logs for suspicious patterns and consider deploying a Web Application Firewall (WAF) to block brute‑force attempts.
Impact
- Unauthorized Access – Attackers can recover attachment passwords or generate collisions, gaining access to sensitive files protected by weak SHA‑1 hashes.
- Data Breach – Compromised attachments may expose confidential information, intellectual property, or internal documents.
- Compliance Violations – Use of a deprecated cryptographic algorithm may violate industry standards (e.g., PCI‑DSS, HIPAA) and lead to regulatory penalties.
- Reputational Damage – A successful breach can erode user trust and harm the organization’s public image.
- Operational Disruption – Remediation efforts, including emergency patching and password resets, consume valuable IT resources.
All information is based on publicly disclosed CVE-2026-48488 data and associated advisories.
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Sources:
Reported By: github.com
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