CVE-2026-15726

MEDIUM 6.4

Serious Slider <= 1.4.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'theme' Shortcode Attribute

CVSS Score

6.4

EPSS Score

0.0%

EPSS Percentile

0th

The Serious Slider plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'theme' Shortcode Attribute in all versions up to, and including, 1.4.0 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.

CWE	CWE-79
Vendor	cryout-creations
Product	serious slider
Published	Aug 16, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

cryout-creations / Serious Slider

0 ≤ 1.4.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

wordfence.com: https://www.wordfence.com/threat-intel/vulnerabilities/id/c8f45054-e6a4-403b-94eb-2dd2a4840c22?source=cve plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/cryout-serious-slider/tags/1.4.0/inc/shortcodes.php#L244 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/cryout-serious-slider/tags/1.4.0/inc/shortcodes.php#L55 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/cryout-serious-slider/tags/1.4.0/inc/shortcodes.php#L102 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/cryout-serious-slider/tags/1.4.0/inc/shortcodes.php#L111 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/changeset?reponame=&old=3640247%40cryout-serious-slider&new=3640247%40cryout-serious-slider

Credits

Wordfence PRISM