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Critical · 9.8 Scanner template Public exploit CVE-2026-61511 EUVD-2026-49312GHSA-43hg-f3wj-j2m6

vBulletin < 6.2.2 Eval Injection RCE via vb5/template/runtime.php

Published Jul 27, 2026 · Updated Nov 3, 2026 · Assigned by VulnCheck

Vendor: vBulletin Product: vBulletin

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.

Affected products

VendorProductAffectedFixed
vBulletin vBulletin 5.0.0 – ≤ 5.7.5, 6.0.0 – ≤ 6.2.1 6.2.2

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 4 repositories

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Automated scanner template

A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.

Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.

Advisories 1

References