--- title: Public Exploit Lands for vBulletin’s Pre-Auth RCE,... description: A public proof-of-concept exploit for CVE-2026-61511, a critical pre-authentication remote code execution vulnerability in vBulletin (CVSS 9.8), was published... canonical: https://daily.dev/posts/public-exploit-lands-for-vbulletin-s-pre-auth-rce-cve-2026-61511-5ndquq9lk twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Public Exploit Lands for vBulletin’s Pre-Auth RCE, CVE-2026-61511 | daily.dev og:description: A public proof-of-concept exploit for CVE-2026-61511, a critical pre-authentication remote code execution vulnerability in vBulletin (CVSS 9.8), was published... og:url: https://daily.dev/posts/public-exploit-lands-for-vbulletin-s-pre-auth-rce-cve-2026-61511-5ndquq9lk og:image: https://api.daily.dev/og/posts/5ndQuQ9LK.png og:image:alt: Public Exploit Lands for vBulletin’s Pre-Auth RCE, CVE-2026-61511 og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Public Exploit Lands for vBulletin’s Pre-Auth RCE, CVE-2026-61511 **[Latest Hacking News](https://daily.dev/sources/lhn)** · 5 min read · 0 upvotes · 0 comments ## Summary A public proof-of-concept exploit for CVE-2026-61511, a critical pre-authentication remote code execution vulnerability in vBulletin (CVSS 9.8), was published on July 27. The flaw resides in the `vB5_Template_Runtime::runMaths()` method, which passes insufficiently filtered user input to PHP's `eval()`. Attackers can exploit the `ajax/render/pagenav` endpoint without authentication using a 'phpfuck' technique — constructing executable PHP from only digits, parentheses, and operators. Affected versions include vBulletin 5.0.0 through 6.2.1; version 6.2.2 is patched. Self-hosted installs that missed the June/July patch cycle are at immediate risk. Mitigations include upgrading to 6.2.2, applying WAF rules on the `pagenav[pagenumber]` parameter, and reviewing access logs for exploitation attempts dating back to late June. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Critical phpBB Vulnerability: Auth Bypass \+ RCE Since 2014](https://daily.dev/posts/critical-phpbb-vulnerability-auth-bypass-rce-since-2014-636hneaei) · Aikido Security · 0 upvotes · 0 comments - [phpBB forum fixes auth bypass bug lurking for a decade](https://daily.dev/posts/phpbb-forum-fixes-auth-bypass-bug-lurking-for-a-decade-khey5ws8c) · BleepingComputer · 0 upvotes · 1 comments - [CVE-2026-48907: How the Joomla JCE Exploit Works and What to Do About It](https://daily.dev/posts/cve-2026-48907-how-the-joomla-jce-exploit-works-and-what-to-do-about-it-nnouuvxo2) · Latest Hacking News · 0 upvotes · 0 comments --- Tags: [#security](https://daily.dev/tags/security), [#php](https://daily.dev/tags/php) [View this post on daily.dev](https://daily.dev/posts/public-exploit-lands-for-vbulletin-s-pre-auth-rce-cve-2026-61511-5ndquq9lk) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Public Exploit Lands for vBulletin’s Pre-Auth RCE, CVE-2026-61511","url":"https://daily.dev/posts/public-exploit-lands-for-vbulletin-s-pre-auth-rce-cve-2026-61511-5ndquq9lk","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/public-exploit-lands-for-vbulletin-s-pre-auth-rce-cve-2026-61511-5ndquq9lk"},"datePublished":"2026-07-28T13:16:03.658Z","dateModified":"2026-07-28T18:48:42.363Z","description":"A public proof-of-concept exploit for CVE-2026-61511, a critical pre-authentication remote code execution vulnerability in vBulletin (CVSS 9.8), was published...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/8e4cdbee9c0b9959e0b27d2abfa1eca5?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/8e4cdbee9c0b9959e0b27d2abfa1eca5?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Latest Hacking News","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Latest Hacking News","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/5110318ded6e43f1bb12facdeb2b1965","url":"https://daily.dev/sources/lhn"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/public-exploit-lands-for-vbulletin-s-pre-auth-rce-cve-2026-61511-5ndquq9lk","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"security,php","timeRequired":"PT5M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Latest Hacking News","item":"https://daily.dev/sources/lhn"},{"@type":"ListItem","position":3,"name":"Public Exploit Lands for vBulletin’s Pre-Auth RCE, CVE-2026-61511"}]} ```