{"id":"CVE-2026-61511","title":"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 c…","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 c…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-95"],"published":"2026-07-27","updated":"2026-10-14","sourceUpdated":"2026-10-14T04:18:24.660","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-61511","references":[{"url":"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","label":"disclosure@vulncheck.com"},{"url":"https://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4509404-vbulletin-6-2-2-is-available","label":"disclosure@vulncheck.com"},{"url":"https://karmainsecurity.com/KIS-2026-13","label":"disclosure@vulncheck.com"},{"url":"https://ssd-disclosure.com/vbulletin-runtime-template-runmaths-preauth-rce/","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/vbulletin-eval-injection-rce-via-vb5-template-runtime-php","label":"disclosure@vulncheck.com"},{"url":"http://seclists.org/fulldisclosure/2026/Aug/29","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd","exploit-available"],"epss":0.05607,"epssPercentile":0.92751,"exploits":{"github":5,"githubRepos":["https://github.com/tc4dy/CVE-2026-61511-PoC-Exploit","https://github.com/puj790201-lab/cve-2026-61511","https://github.com/HORKimhab/CVE-2026-61511"],"nuclei":["CVE-2026-61511"],"checkedAt":"2026-10-14T05:15:02.605Z"},"exploitAvailable":true,"ingestedAt":"2026-10-14T05:14:27.624Z","slug":"CVE-2026-61511","body":"## Overview\n\nvBulletin 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"abyssal","depthScore":67,"depthScoreParts":{"impact":53.9,"likelihood":1.1,"exploitation":12,"ransomware":0},"changes":[]}