{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","favicon":"https://feed.craftedsignal.io/favicon-32x32.png","feed_url":"https://feed.craftedsignal.io/products/user-session-synchronizer-1.4.0/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":9.8,"id":"CVE-2026-15341"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["User Session Synchronizer (1.4.0)"],"_cs_severities":["critical"],"_cs_tags":[],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eThe User Session Synchronizer plugin for WordPress, in all versions up to and including 1.4.0, is vulnerable to a critical authentication bypass via the \u003ccode\u003esynchronize_session()\u003c/code\u003e function. This function is hooked into the WordPress \u003ccode\u003einit\u003c/code\u003e action, ensuring it executes on every incoming HTTP request. The vulnerability arises because the plugin fails to perform nonce, capability, or shared-secret verification on the attacker-controlled \u003ccode\u003eussync-key\u003c/code\u003e, \u003ccode\u003eussync-token\u003c/code\u003e, and \u003ccode\u003eussync-ref\u003c/code\u003e parameters.\u003c/p\u003e\n\u003cp\u003eWhen an attacker provides a \u003ccode\u003eussync-key\u003c/code\u003e that does not correspond to a registered slot, the function reverts to using default, predictable values: the encryption key becomes the result of \u003ccode\u003emd5('')\u003c/code\u003e and the referer allowlist is neutralized. Additionally, the AES-256-CBC IV is hard-coded as \u003ccode\u003emd5('another-secret')\u003c/code\u003e. An attacker can leverage these predictable values to craft a malicious request containing an encrypted target email address. Successful exploitation forces the plugin to call \u003ccode\u003ewp_set_auth_cookie()\u003c/code\u003e for the specified user, granting the attacker full authenticated access to the target account without requiring any prior site secrets or credentials.\u003c/p\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-15341 allows for unauthenticated full account takeover of any user on the WordPress site. Because the vulnerability does not distinguish between user roles, an attacker can obtain administrator-level access. This poses a severe risk of complete site compromise, including arbitrary code execution through theme or plugin management, sensitive data exfiltration, and persistence mechanisms.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eImmediately update the 'User Session Synchronizer' plugin to a version beyond 1.4.0 or remove it from the WordPress installation.\u003c/li\u003e\n\u003cli\u003eInspect webserver access logs for anomalous requests containing the \u003ccode\u003eussync-key\u003c/code\u003e, \u003ccode\u003eussync-token\u003c/code\u003e, or \u003ccode\u003eussync-ref\u003c/code\u003e parameters.\u003c/li\u003e\n\u003cli\u003eReview administrative logs for suspicious login activity or user privilege modifications occurring during the period before the patch was applied.\u003c/li\u003e\n\u003cli\u003eDeploy the provided Sigma rule to detect exploitation attempts targeting the identified parameters.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-08-15T04:16:22Z","date_published":"2026-08-15T04:16:22Z","id":"https://feed.craftedsignal.io/briefs/2026-08-cve-2026-15341-wordpress-auth-bypass/","summary":"The User Session Synchronizer plugin for WordPress contains an authentication bypass vulnerability (CVE-2026-15341) in its synchronize_session() function, allowing unauthenticated attackers to hijack any user account, including administrators.","title":"Authentication Bypass in User Session Synchronizer WordPress Plugin","url":"https://feed.craftedsignal.io/briefs/2026-08-cve-2026-15341-wordpress-auth-bypass/"}],"language":"en","title":"CraftedSignal Threat Feed - User Session Synchronizer (1.4.0)","version":"https://jsonfeed.org/version/1.1"}