Two remote code execution vulnerabilities in vBulletin

Published: 2025-05-27 | Updated: 2025-06-06

Risk	Critical
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2025-48827 CVE-2025-48828
CWE-ID	CWE-424 CWE-94
Exploitation vector	Network
Public exploit	Vulnerability #1 is being exploited in the wild. Vulnerability #2 is being exploited in the wild.
Vulnerable software	vBulletin Web applications / Forum & blogging software
Vendor	vBulletin

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper protection of alternate path

EUVDB-ID: #VU109837

Risk: Critical

CVSSv4.0: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red]

CVE-ID: CVE-2025-48827

CWE-ID: CWE-424 - Improper Protection of Alternate Path

Exploit availability: Yes

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

vBulletin: 5.7.5 - 6.0.3

CPE2.3

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.

2) Code Injection

EUVDB-ID: #VU110022

Risk: Critical

CVSSv4.0: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red]

CVE-ID: CVE-2025-48828

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

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.