{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-35056/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":8.8,"id":"CVE-2026-35056"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["critical"],"_cs_tags":["rce","xenforo","cve-2026-35056","code-injection"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eCVE-2026-35056 describes a remote code execution vulnerability in XenForo versions prior to 2.3.9 and 2.2.18. This vulnerability allows an authenticated attacker with administrative privileges to execute arbitrary code on the server. The attacker must have valid administrator panel access to exploit this flaw. Successful exploitation leads to complete control over the affected XenForo instance and potentially the underlying server. Organizations using vulnerable XenForo versions are at high risk.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker gains valid administrative credentials to the XenForo panel, likely through credential theft or brute-force attack.\u003c/li\u003e\n\u003cli\u003eThe attacker logs into the XenForo admin panel.\u003c/li\u003e\n\u003cli\u003eThe attacker identifies an administrative function that allows for the injection of malicious code (e.g., template modification, plugin installation, or similar).\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a payload containing malicious code (e.g., PHP code) designed to execute arbitrary commands on the server.\u003c/li\u003e\n\u003cli\u003eThe attacker injects the malicious payload into the vulnerable administrative function.\u003c/li\u003e\n\u003cli\u003eThe attacker triggers the execution of the injected payload by accessing the modified function or by some other user interaction.\u003c/li\u003e\n\u003cli\u003eThe malicious code executes on the server, granting the attacker initial access.\u003c/li\u003e\n\u003cli\u003eThe attacker can then leverage this access to install a web shell, escalate privileges, move laterally, or achieve other objectives.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-35056 allows a malicious administrator to execute arbitrary code on the XenForo server. This could lead to complete system compromise, data theft, defacement of the XenForo forum, or use of the server as a launching point for further attacks. Given the potentially sensitive data stored in forum databases, this vulnerability poses a significant risk to confidentiality, integrity, and availability.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eImmediately upgrade XenForo to version 2.3.9 or 2.2.18 or later to patch CVE-2026-35056.\u003c/li\u003e\n\u003cli\u003eImplement strong password policies and multi-factor authentication to prevent unauthorized access to administrator accounts.\u003c/li\u003e\n\u003cli\u003eMonitor XenForo admin panel activity for suspicious behavior, such as unexpected template modifications or plugin installations.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule to detect command execution from the web server process.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-01T01:16:41Z","date_published":"2026-04-01T01:16:41Z","id":"/briefs/2026-04-xenforo-rce/","summary":"XenForo before 2.3.9 and 2.2.18 allows remote code execution by authenticated, malicious admin users with admin panel access.","title":"XenForo RCE via Authenticated Admin User (CVE-2026-35056)","url":"https://feed.craftedsignal.io/briefs/2026-04-xenforo-rce/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-35056","version":"https://jsonfeed.org/version/1.1"}