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CVE-2026-61511— vBulletin < 6.2.2 Eval Injection RCE via vb5/template/runtime.php

Quick assessment

Affected
vBulletin vBulletin
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

vBulletin是美国vBulletin公司开源的一款基于PHP和MySQL的开源Web论坛程序。 vBulletin 5.7.5及之前的5.x版本和6.2.1及之前的6.x版本存在代码注入漏洞，该漏洞源于vB5_Template_Runtime::runMaths()方法存在eval注入漏洞，正则过滤器限制不足，攻击者可通过pagenav[pagenumber]参数利用phpfuck-style编码注入并执行任意PHP代码。

CVSS 9.8 · Critical EPSS 5.61% · P93

Public Exploits 1

Nuclei · 1 CVE-2026-61511.yaml [template]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
vBulletin vBulletin 5.0.0≤ 5.7.5 affected
6.0.0≤ 6.2.1 affected
6.2.2 unaffected
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I. Basic Information for CVE-2026-61511

Vulnerability Information
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Vulnerability Title
vBulletin < 6.2.2 Eval Injection RCE via vb5/template/runtime.php
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
动态执行代码中指令转义处理不恰当(Eval注入)
Source: CVE Program / CVE List V5
Vulnerability Title
vBulletin 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
vBulletin是美国vBulletin公司开源的一款基于PHP和MySQL的开源Web论坛程序。 vBulletin 5.7.5及之前的5.x版本和6.2.1及之前的6.x版本存在代码注入漏洞，该漏洞源于vB5_Template_Runtime::runMaths()方法存在eval注入漏洞，正则过滤器限制不足，攻击者可通过pagenav[pagenumber]参数利用phpfuck-style编码注入并执行任意PHP代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
vBulletin vBulletin 5.0.0 ~ 5.7.5 -

II. Public POCs for CVE-2026-61511

# POC Description Source Link Shenlong Link
1 vBulletin 5.x through 5.7.5 and 6.x through 6.2.1 contain an eval injection vulnerability caused by insufficiently restrictive regex filtering in vB5_Template_Runtime::runMaths(), letting unauthenticated remote attackers execute arbitrary PHP code via the pagenav[pagenumber] parameter in ajax/render template route. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-61511.yaml POC Details
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III. Intelligence Information for CVE-2026-61511

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Vendor Advisories for CVE-2026-61511 (3)

IV. Related Vulnerabilities

Same product: vBulletin
Same vendor: vBulletin
Same weakness: CWE-95

V. Comments for CVE-2026-61511

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