CVE-2026-61511
CVE-2026-61511
9.3
CriticalPublished:
Last updated:
Source:disclosure@vulncheck.com
Deferred
Weakness (CWE)
CVSS Vector
v4.0- Attack Vector
- Network
- Attack Complexity
- Low
- Attack Requirements
- None
- Privileges Required
- None
- User Interaction
- None
- Confidentiality (Vulnerable)
- High
- Integrity (Vulnerable)
- High
- Availability (Vulnerable)
- High
- Confidentiality (Subsequent)
- None
- Integrity (Subsequent)
- None
- Availability (Subsequent)
- None
Description
vBulletin 5.x through 5.7.5 and 6.x through 6.2.1 contains an eval injection vulnerability in the vB5_Template_Runtime::runMaths() method within the template runtime that allows unauthenticated remote attackers to execute arbitrary PHP code by supplying crafted input through the pagenav[pagenumber] parameter. Attackers can exploit the insufficiently restrictive regex filter by using phpfuck-style encoding with permitted characters to inject and execute arbitrary PHP code via the unauthenticated ajax/render template route without any authentication.
References
disclosure@vulncheck.com
https://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4509358-security-patch-released-for-vbulletin-6-2-1-6-2-0-and-6-1-6disclosure@vulncheck.com
https://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4509404-vbulletin-6-2-2-is-availabledisclosure@vulncheck.com
https://karmainsecurity.com/KIS-2026-13disclosure@vulncheck.com
https://ssd-disclosure.com/vbulletin-runtime-template-runmaths-preauth-rce/disclosure@vulncheck.com
https://www.vulncheck.com/advisories/vbulletin-eval-injection-rce-via-vb5-template-runtime-php