What’s Vulnerable › Vulnerabilities

CVE-2026-8886: hk_shortcode <= 1.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'title' Shortcode Attribute

• 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 hk_shortcode plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'title-plane' shortcode in versions up to, and including, 1.0. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes in the huankong_post_short_title_plane() function, where the 'title' attribute is concatenated directly into HTML output without any 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

• huankong hk_shortcode: through 1.0

References

• https://plugins.trac.wordpress.org/browser/hk-shortcode/tags/1.0/function/shortcode.php#L6
• https://plugins.trac.wordpress.org/browser/hk-shortcode/tags/1.0/function/shortcode.php#L8
• https://www.wordfence.com/threat-intel/vulnerabilities/id/ed1a7872-e268-460d-82f1-b047335a9977?source=cve

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