Vulnerability details
CVE-2026-61511
vbulletin vBulletin
vBulletin < 6.2.2 Eval Injection RCE via vb5/template/runtime.php
CVSS 4.0
9.3Critical
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.3Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | 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 |
| 9.8Critical | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| vbulletin | vBulletin | 5.0.0 ≤ v ≤ 5.7.5 | CVEProject cvelistV5 (CNA) |
| vbulletin | vBulletin | 6.0.0 ≤ v ≤ 6.2.1 | CVEProject cvelistV5 (CNA) |
References and advisories
6- https://karmainsecurity.com/KIS-2026-13 technical-descriptionexploit
- https://ssd-disclosure.com/vbulletin-runtime-template-runmaths-preauth-rce/ technical-descriptionexploit
- 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
- https://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4509404-vbulletin-6-2-2-is-available
- https://www.vulncheck.com/advisories/vbulletin-eval-injection-rce-via-vb5-template-runtime-php third-party-advisory
- http://seclists.org/fulldisclosure/2026/Aug/29
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Details
- Published
- 2026-07-27
- Last updated
- 2026-11-04
- State
- Published
- Assigner (CNA)
- VulnCheck
Exploit prediction (EPSS)
5.6%
Probability of exploitation in 30 days
92.9%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-95Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')