CVE-2026-1821: Microtango <= 0.9.29 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes

Severity: medium (CVSS 6.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-11 · updated 2026-06-17
Weakness: CWE-79

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.

Affected products

Microtango: through 0.9.29

References

https://plugins.trac.wordpress.org/browser/microtango/tags/0.9.29/microtango-init.php#L129
https://plugins.trac.wordpress.org/browser/microtango/trunk/microtango-init.php#L129
https://plugins.trac.wordpress.org/changeset/3455880/
https://www.wordfence.com/threat-intel/vulnerabilities/id/27657d29-e834-4f05-8fe9-7db0ab96f67d?source=cve

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