CVE-2026-2433
MEDIUMCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
2Description
The RSS Aggregator - RSS Import, News Feeds, Feed to Post, and Autoblogging plugin for WordPress is vulnerable to DOM-Based Cross-Site Scripting via postMessage in all versions up to, and including, 5.0.11. This is due to the plugin's admin-shell.js registering a global message event listener without origin validation (missing event.origin check) and directly passing user-controlled URLs to window.open() without URL scheme validation. This makes it possible for unauthenticated attackers to execute arbitrary JavaScript in the context of an authenticated administrator's session by tricking them into visiting a malicious website that sends crafted postMessage payloads to the plugin's admin page.
Analysis
DOM-based XSS in the RSS Aggregator plugin for WordPress (versions up to 5.0.11) allows unauthenticated attackers to execute arbitrary JavaScript in an administrator's browser session by exploiting missing origin validation in postMessage handlers. An attacker can craft a malicious website that tricks an admin into visiting it, sending crafted payloads that bypass the plugin's unsafe URL handling in admin-shell.js. …
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Remediation
Within 30 days: Identify affected systems running for WordPress is vulnerable to DOM-Based Cross-Site Scriptin and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.
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