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Dossier · Vulnerability

Vulnerability · NVD published 2026-07-27

CVE-2026-61511

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.

Signals

Exploited in the wild
Not on KEVNot in CISA's catalogue as of the last daily pull. Absence is not proof of safety.
EPSS · 30-day forecast
6%Chance of exploitation in the next 30 days, 93th percentile of all CVEs. A forecast; KEV outranks it.
CVSS · NVD · CRITICAL
9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Internet exposure
not stated by sourcesNo exposure census on this CVE's dispatches.

Exploits

6 known · links only

GitHub PoCs · by trust, then stars5

  1. tc4dy/CVE-2026-61511-PoC-Exploit ↗Trust ok 100

    CVE-2026-61511 – vBulletin Pre-Auth RCE (CVSS 9.8). Vuln 5.x/6.x (unpatched). Multi-exploit via Endpoint Pool, AJAX, PHPFuck WAF bypass. Full toolkit: reverse shell, proxy, persistence, webshell, database operations, firewall control, log management, mass scanning. 2 versions: multi-exploit & safe-check. Python 3.8+ Use Ethically, Stay Legal.

    ★ 6 · created 2026-07-29

  2. puj790201-lab/cve-2026-61511 ↗Trust ok 100

    cve-2026-61511

    ★ 3 · created 2026-07-28

  3. codeb0ssx/Ultimate-CVE-2026-61511 ↗Trust ok 100

    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

    ★ 0 · created 2026-07-29

  4. HORKimhab/CVE-2026-61511 ↗Trust ok 100

    CVE-2026-61511 - Draft or Todo

    ★ 0 · created 2026-07-28

  5. shootcannon/CVE-2026-61511 ↗Trust ok 100

    ★ 0 · created 2026-07-30

Fake proof-of-concept repositories have been used to deliver malware to the researchers who run them. The trust verdict is our engine's heuristic over the repository (account age, what it ships, how its stars arrived); it is a reason to read the code first, not a finding about its author.

Nuclei1

  1. vBulletin 6.x - Remote Code Execution ↗

    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.

    yaml · seen 2026-10-18

On the wire

1 dispatch
  1. New vBulletin Vulnerability!VULN

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