What is CVE-2026-61511?

CVE-2026-61511 is a critical-severity vulnerability in Vbulletin, classified under Eval Injection. CVSS score: 9.8/10. Published 2026-07-27.

How severe is CVE-2026-61511?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Vbulletin

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 cod…

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Vbulletin — versions 5.0.0, 6.0.0, 6.2.2

Weakness classification (CWE)

CWE-95 — Eval Injection

References

disclosure@vulncheck.com (technical-description, exploit)
disclosure@vulncheck.com (technical-description, exploit)
disclosure@vulncheck.com
disclosure@vulncheck.com
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-61511?: CVE-2026-61511 is a critical-severity vulnerability in Vbulletin, classified under Eval Injection. CVSS score: 9.8/10. Published 2026-07-27.
How severe is CVE-2026-61511?: Critical severity. CVSS v3 base score is 9.8 out of 10.