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CVE-2026-8871: Formidable Kinetic <= 1.1.01 - 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: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-27 · updated 2026-06-17
• Weakness: CWE-79

Description

The Formidable Kinetic plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'kinetic_link' shortcode in versions up to, and including, 1.1.01. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes (notably 'window', 'class', and 'label') in the FrmKinetic::link() function, which are concatenated directly into HTML attributes of an anchor tag. 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

• thomstark Formidable Kinetic: through 1.1.01

References

• https://plugins.trac.wordpress.org/browser/formidable-kinetic/trunk/formidable-kinetic.php#L34
• https://plugins.trac.wordpress.org/browser/formidable-kinetic/trunk/formidable-kinetic.php#L70
• https://www.wordfence.com/threat-intel/vulnerabilities/id/6f849ec6-1c90-4f98-a367-fea87ddc5870?source=cve

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