CVE-2026-61511
vBulletin < 6.2.2 Eval Injection RCE via vb5/template/runtime.php
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-95 |
| Vendor | vbulletin |
| Product | vbulletin |
| Published | Jul 27, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
vBulletin / vBulletin
5.0.0 ≤ 5.7.5 6.0.0 ≤ 6.2.1
References
karmainsecurity.com: https://karmainsecurity.com/KIS-2026-13 ssd-disclosure.com: https://ssd-disclosure.com/vbulletin-runtime-template-runmaths-preauth-rce/ forum.vbulletin.com: https://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4509358-security-patch-released-for-vbulletin-6-2-1-6-2-0-and-6-1-6 forum.vbulletin.com: https://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4509404-vbulletin-6-2-2-is-available vulncheck.com: https://www.vulncheck.com/advisories/vbulletin-eval-injection-rce-via-vb5-template-runtime-php
Credits
Egidio Romano