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Type a plugin or theme and the version you run, and we’ll show every known vulnerability that affects it, from the 390,007 records in our vulnerability database. The version is listed under Plugins in your WordPress dashboard.
Plugin · user-session-synchronizer
User Session Synchronizer
2 known vulnerabilities on record. Add your version above to see which ones affect you.
Aug 14, 2026User Session Synchronizer: Authentication Bypass leading to Account TakeoverCVE-2026-15341 · affects up to 1.4.0 · reported by WordfenceCritical 9.8
The User Session Synchronizer plugin for WordPress is vulnerable to Authentication Bypass leading to Account Takeover in all versions up to, and including, 1.4.0. The `synchronize_session()` function, hooked on `init` and therefore executed on every request, performs no nonce, capability, or shared-secret validation against the attacker-supplied `ussync-key`, `ussync-token`, and `ussync-ref` parameters; when `ussync-key` references an unregistered slot, `get_option()` returns `false` for both the secret key and the domain list, causing the AES-256-CBC encryption key to degrade to the fully predictable `md5('')` and the referer allowlist to collapse to an empty-string match, while the AES IV is unconditionally hard-coded as `md5('another-secret')`. This makes it possible for unauthenticated attackers to supply a crafted request encrypting any known or guessable user email address in the `ussync-ref` parameter, causing the handler to call `wp_set_auth_cookie()` for the matched user and granting full authentication as that user — including administrators — with no prior knowledge of site secrets.
NVD recordplugins.trac.wordpress.orgplugins.trac.wordpress.org
Apr 9, 2025User Session Synchronizer: Cross-Site Request Forgery (CSRF)CVE-2025-32612 · affects up to 1.4.0 · reported by PatchstackHigh 7.1
Cross-Site Request Forgery (CSRF) vulnerability in rafasashi User Session Synchronizer user-session-synchronizer allows Stored XSS.This issue affects User Session Synchronizer: from n/a through <= 1.4.0.
Versions are matched against the affected ranges published with each record. A plugin can ship a fix under its own numbering, so if something looks off, check the linked record. Want the whole site checked at once? Run the free website check.
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