Medium severity · published Aug 28, 2026
CVE-2026-15798
Smart Slider 3 <= 3.5.1.38 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'slider' Block Attribute
6.4
CVSS
0.4%
EPSS
No
On KEV
Description
The Smart Slider 3 plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'slider' Block Attribute in all versions up to, and including, 3.5.1.38 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. The injected scripts execute specifically when a user opens the affected post in the WordPress block editor, making Editors and Administrators the primary targets.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SS
Smart Slider 3 · nextendweb
through 3.5.1.38 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-15798
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-15798
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/smart-slider-3/tags/3.5.1.34/Nextend/SmartSlider3/Platform/WordPress/Integration/Gutenberg/Gutenberg.php#L55
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/smart-slider-3/tags/3.5.1.34/Nextend/SmartSlider3/Platform/WordPress/Shortcode/Shortcode.php#L270
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/smart-slider-3/tags/3.5.1.34/Public/SmartSlider3/Platform/WordPress/Integration/Gutenberg/Assets/dist/gutenberg-block.js#L51
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/smart-slider-3/tags/3.5.1.38/Nextend/SmartSlider3/Platform/WordPress/Integration/Gutenberg/Gutenberg.php#L55
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/smart-slider-3/tags/3.5.1.38/Nextend/SmartSlider3/Platform/WordPress/Shortcode/Shortcode.php#L270
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/smart-slider-3/tags/3.5.1.38/Public/SmartSlider3/Platform/WordPress/Integration/Gutenberg/Assets/dist/gutenberg-block.js#L51
More from Smart Slider 3
8.8
CVE-2022-45845
Deserialization of Untrusted Data vulnerability in Nextend Smart Slider 3.This issue affects Smart Slider 3: from n/a through 3.5.1.9
8.8
CVE-2022-3357
Smart Slider 3 < 3.5.1.11 - PHP Object Injection
6.5
CVE-2026-3098
Smart Slider 3 <= 3.5.1.33 - Authenticated (Subscriber+) Arbitrary File Read via actionExportAll
6.4
CVE-2026-14876
Smart Slider 3 <= 3.5.1.38 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'data-href' Attribute in Custom HTML Block
5.4
CVE-2026-4065
Smart Slider 3 <= 3.5.1.33 - Missing Authorization to Authenticated (Contributor+) Slider Data Read and Image Record Manipulation