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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 remot…

Critical CVSS 9.8
CVECVE-2026-61511
First seen2026-07-28 07:15 UTC
Disclosed2026-07-27 14:16 UTC
Last updated2026-07-28 07:15 UTC
Channel statusauto

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 encoding with permitted characters to inject and execute arbitrary PHP code via the unauthenticated…

In-depth triage · Auto channel

No in-depth report has been generated yet (DR-003 v2 AI pipeline is under construction).

Lint boundary warnings (4)

The following non-blocking warnings were raised during the lint phase of this triage (e.g. reference URLs not yet on the allowlist). They do not affect entry usability and are disclosed for transparency (see DR-002).

  • REF_URL_NOT_ALLOWLISTED url not in allowlist: 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
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4509404-vbulletin-6-2-2-is-available
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://karmainsecurity.com/KIS-2026-13
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://ssd-disclosure.com/vbulletin-runtime-template-runmaths-preauth-rce/

Sources

  • NVD DATABASE

Original Links

Timeline

  1. nvd_ingest NVD