CVE-2026-8841 Cross-site scripting in Extra Settings for RocketChat
Authenticated attackers can inject arbitrary scripts via shortcode attributes, leading to code execution when users view affected pages.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-8841?
CVE-2026-8841 is a medium-severity cross-site scripting vulnerability in andrewabarber Extra Settings for RocketChat, published on 9 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Extra Settings for RocketChat plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'rocketchat' shortcode's 'title' attribute in versions up to, and including, 0.1. This is due to insufficient input sanitization and output escaping in the rxstg_shortcode() function, which concatenates the user-supplied 'title' attribute directly into HTML output. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Weakness: CWE-79
Which versions are affected by CVE-2026-8841?
How do I fix CVE-2026-8841?
No fix has been published for CVE-2026-8841 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-2026-8841 being exploited?
There is no known exploitation of CVE-2026-8841 in the wild and no public exploit code.
Sources
Also known as GHSA-874q-xpp4-3fjr.