CVE-2026-8873: Content Slideshow <= 2.4.1 - 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 Content Slideshow plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Shortcode Attributes in all versions up to, and including, 2.4.1 due to insufficient input sanitization and output 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

celloexpressions Content Slideshow: through 2.4.1

References

https://plugins.trac.wordpress.org/browser/content-slideshow/tags/2.4.1/slideshow-widget-shortcode.php#L14
https://plugins.trac.wordpress.org/browser/content-slideshow/tags/2.4.1/slideshow-widget-shortcode.php#L143
https://www.wordfence.com/threat-intel/vulnerabilities/id/9548f647-9fcb-481c-874e-0184609283fe?source=cve

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