CVE-2026-61511
vBulletin < 6.2.2 Eval Injection RCE via vb5/template/runtime.php
- State
- Published
- Severity
- 9.3 Critical
- Published
- Jul 27, 2026
- Updated
- Oct 14, 2026
- Reserved
- Jul 10, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
Affected Products
| Product | Versions |
|---|---|
vBulletinvBulletin |
|
References
- Karma(In)Security Disclosuretechnical-descriptionexploit
- SSD Secure Disclosuretechnical-descriptionexploit
- 6.2.1, 6.2.0, 6.1.6 Security Announcement
- 6.2.2 Release Notes
- https://www.vulncheck.com/advisories/vbulletin-eval-injection-rce-via-vb5-template-runtime-phpthird-party-advisory
- http://seclists.org/fulldisclosure/2026/Aug/29
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