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CVE-2026-0916: Related Posts by Taxonomy <= 2.7.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'related_posts_by_tax' Shortcode

• 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: 2026-01-16 · updated 2026-06-17
• Weakness: CWE-79

Description

The Related Posts by Taxonomy plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'related_posts_by_tax' shortcode in all versions up to, and including, 2.7.6 due to insufficient input sanitization and output escaping on user supplied attributes. 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

• keesiemeijer Related Posts by Taxonomy: through 2.7.6

References

• https://plugins.trac.wordpress.org/browser/related-posts-by-taxonomy/tags/2.7.6/includes/functions.php#L259
• https://plugins.trac.wordpress.org/browser/related-posts-by-taxonomy/tags/2.7.7/includes/functions.php#L259
• https://www.wordfence.com/threat-intel/vulnerabilities/id/0582fe7d-884c-4019-837a-861d36ccc842?source=cve

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