What’s Vulnerable › Vulnerabilities

CVE-2026-6255: Simple Owl Shortcodes <= 2.1.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'num' 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: 2026-05-05 · updated 2026-06-17
• Weakness: CWE-79

Description

The Simple Owl Shortcodes plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'num' attribute of the 'owls_wrapper' shortcode in all versions up to, and including, 2.1.1 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

• sszdh Simple Owl Shortcodes: through 2.1.1

References

• https://plugins.trac.wordpress.org/browser/simple-owl-shortcodes/tags/2.1.1/inc/owls_wrapper.php#L11
• https://plugins.trac.wordpress.org/browser/simple-owl-shortcodes/trunk/inc/owls_wrapper.php#L11
• https://www.wordfence.com/threat-intel/vulnerabilities/id/e33a2f27-20c2-4963-9558-1eead0515690?source=cve

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