SB2025052717 - Two remote code execution vulnerabilities in vBulletin

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Improper protection of alternate path (CVE-ID: CVE-2025-48827)

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to missing authorization checks within protected API controllers methods. A remote non-authenticated attacker can send a specially crafted request to the website and execute arbitrary PHP code on the system.

Successful exploitation of the vulnerability requires PHP 8.1 to be used by the web application.

2) Code Injection (CVE-ID: CVE-2025-48828)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation. A remote attacker can send a specially crafted request and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Remediation

Install update from vendor's website.

References

• https://karmainsecurity.com/dont-call-that-protected-method-vbulletin-rce
• https://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4491049-security-patch-released-for-vbulletin-6-x-and-5-7-5
• https://github.com/advisories/GHSA-23fp-mrfv-cwv4
• https://blog.kevintel.com/vbulletin-replaceadtemplate-kev/
• https://kevintel.com/CVE-2025-48828