{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/user-frontend-ai-powered-frontend-posting-user-directory-profile-membership--user-registration-plugin--4.3.1/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":8.8,"id":"CVE-2026-5127"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["User Frontend: AI Powered Frontend Posting, User Directory, Profile, Membership \u0026 User Registration plugin \u003c= 4.3.1"],"_cs_severities":["high"],"_cs_tags":["deserialization","wordpress","plugin","cve-2026-5127"],"_cs_type":"advisory","_cs_vendors":["WordPress"],"content_html":"\u003cp\u003eThe User Frontend: AI Powered Frontend Posting, User Directory, Profile, Membership \u0026amp; User Registration plugin for WordPress, versions up to and including 4.3.1, contains a deserialization of untrusted data vulnerability (CVE-2026-5127). This flaw stems from the lack of proper input validation and type checking applied to the \u003ccode\u003ewpuf_files\u003c/code\u003e parameter during form submission, coupled with the usage of \u003ccode\u003emaybe_unserialize()\u003c/code\u003e when post content is displayed. An authenticated attacker with subscriber-level privileges can exploit this vulnerability by injecting arbitrary PHP objects. Successful exploitation could lead to arbitrary code execution, deletion of arbitrary files, or other malicious actions, contingent upon the presence of a suitable POP chain on the target system. This vulnerability poses a significant risk to WordPress sites utilizing the affected plugin, potentially allowing attackers to gain complete control over the compromised website.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker authenticates to the WordPress site with subscriber-level or higher privileges.\u003c/li\u003e\n\u003cli\u003eAttacker crafts a malicious HTTP POST request targeting a form submission endpoint. This request includes a serialized PHP object within the \u003ccode\u003ewpuf_files\u003c/code\u003e parameter.\u003c/li\u003e\n\u003cli\u003eThe WordPress application receives the POST request and processes the \u003ccode\u003ewpuf_files\u003c/code\u003e parameter without proper validation or sanitization.\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003emaybe_unserialize()\u003c/code\u003e function is called on the \u003ccode\u003ewpuf_files\u003c/code\u003e parameter\u0026rsquo;s value, unconditionally deserializing the attacker-controlled data.\u003c/li\u003e\n\u003cli\u003eIf a suitable POP chain exists within the WordPress installation or installed plugins, the deserialization process triggers the execution of arbitrary code.\u003c/li\u003e\n\u003cli\u003eThe attacker\u0026rsquo;s code gains execution within the context of the web server.\u003c/li\u003e\n\u003cli\u003eThe attacker can then perform malicious actions such as creating administrative accounts, injecting web shells, or deleting critical files.\u003c/li\u003e\n\u003cli\u003eThe attacker establishes persistence and maintains control over the compromised WordPress site.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-5127 can result in complete compromise of the affected WordPress website. Attackers can gain administrative access, inject malicious code into the site\u0026rsquo;s files and database, deface the website, steal sensitive data, or use the compromised site to launch further attacks. The impact depends on the privileges of the compromised account and the presence of a suitable POP chain. Given the widespread use of WordPress and the popularity of the affected plugin, this vulnerability could potentially impact thousands of websites.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade the \u0026ldquo;User Frontend: AI Powered Frontend Posting, User Directory, Profile, Membership \u0026amp; User Registration\u0026rdquo; plugin to a version greater than 4.3.1 to patch CVE-2026-5127.\u003c/li\u003e\n\u003cli\u003eDeploy the provided Sigma rule \u0026ldquo;Detect CVE-2026-5127 Exploitation Attempt via wpuf_files Parameter\u0026rdquo; to monitor for malicious POST requests containing serialized PHP objects in the \u003ccode\u003ewpuf_files\u003c/code\u003e parameter.\u003c/li\u003e\n\u003cli\u003eReview WordPress access logs for suspicious POST requests to form submission endpoints, focusing on those with unusually long or complex \u003ccode\u003ewpuf_files\u003c/code\u003e parameters to identify potential exploitation attempts (webserver logs).\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-08T09:16:08Z","date_published":"2026-05-08T09:16:08Z","id":"/briefs/2026-05-wordpress-user-frontend-deserialization/","summary":"The User Frontend WordPress plugin is vulnerable to authenticated deserialization, allowing subscriber-level attackers to inject PHP objects for potential arbitrary code execution.","title":"WordPress User Frontend Plugin Deserialization Vulnerability (CVE-2026-5127)","url":"https://feed.craftedsignal.io/briefs/2026-05-wordpress-user-frontend-deserialization/"}],"language":"en","title":"CraftedSignal Threat Feed — User Frontend: AI Powered Frontend Posting, User Directory, Profile, Membership \u0026 User Registration Plugin \u003c= 4.3.1","version":"https://jsonfeed.org/version/1.1"}