CVE-2026-2433 Cross-site scripting in RSS Aggregator – RSS Import, News Feeds, Feed to Post, and Autoblogging
Unauthenticated attackers can execute arbitrary JavaScript in an administrator's session via crafted postMessage payloads, potentially leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-2433?
CVE-2026-2433 is a medium-severity cross-site scripting vulnerability in rebelcode RSS Aggregator – RSS Import, News Feeds, Feed to Post, and Autoblogging, published on 7 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-2433?
How do I fix CVE-2026-2433?
No fix has been published for CVE-2026-2433 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-2433 being exploited?
There is no known exploitation of CVE-2026-2433 in the wild and no public exploit code.
Sources
Also known as GHSA-4j4f-wwp5-72mp.