CRITICALVulnerability
Verified
Global

NVD CRITICAL: CVE-2026-61511 — vBulletin 5.x through 5.7.5 and 6.x through 6.2.1 contains an eval injection vul...

·Source: NIST NVD

Updated:

Executive Summary

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

Analysis

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 Score: 9.8. Published: 2026-07-27T14:16:59.177.

Indicators of Compromise (1)

CVE (1)
CVE-2026-61511
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Jul 27, 2026. Verified by: NIST.

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