PT-2026-43519 · Thomstark+1 · Formidable Kinetic

Dj + 1 · CVE-2026-8871 · Published 2026-05-26 · Updated 2026-06-04

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Formidable Kinetic versions prior to 1.1.02

Description Stored Cross-Site Scripting occurs via the kinetic link shortcode. The issue stems from insufficient input sanitization and output escaping within the FrmKinetic::link() function. Specifically, user-supplied shortcode attributes window, class, and label are concatenated directly into HTML attributes of an anchor tag. This allows authenticated attackers with contributor-level access or higher to inject arbitrary web scripts into pages, which execute when a user visits the affected page.

Recommendations Update to a version newer than 1.1.01. As a temporary mitigation, restrict the use of the kinetic link shortcode or limit user permissions to prevent contributors from editing pages.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-8871

Affected Products

Formidable Kinetic

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-8871 · Security Note
• https://wordfence.com/threat-intel/vulnerabilities/id/6f849ec6-1c90-4f98-a367-fea87ddc5870?source=cve · Note
• https://plugins.trac.wordpress.org/browser/formidable-kinetic/trunk/formidable-kinetic.php#L70 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/6f849ec6-1c90-4f98-a367-fea87ddc5870?source=api-prod · Note
• https://plugins.trac.wordpress.org/browser/formidable-kinetic/trunk/formidable-kinetic.php#L34 · Note
• https://reddit.com/r/StopBadBots/comments/1twww49/insane_record_145_wordpress_plugins_exposed_with · Reddit Post
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-8871 · Note