CVE-2026-1821 Microtango <= 0.9.29 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes
Authenticated attackers with Contributor access can inject arbitrary scripts via shortcode attributes, leading to stored XSS execution for other users.
- 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-2026-1821?
CVE-2026-1821 is a medium-severity cross-site scripting vulnerability in Microtango, published on 11 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Microtango plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'restkey' parameter of the mt_reservation shortcode in all versions up to, and including, 0.9.29 due to insufficient input sanitization and output escaping. 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-2026-1821?
How do I fix CVE-2026-1821?
No fix has been published for CVE-2026-1821 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-2026-1821 being exploited?
There is no known exploitation of CVE-2026-1821 in the wild and no public exploit code.
Sources
Also known as GHSA-c224-wx4m-6qf6.