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CVE-2026-15798— Smart Slider 3 <= 3.5.1.38 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'slider' Block Attribute

Quick assessment

Affected
nextendweb Smart Slider 3
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的 Smart Slider 3 插件在所有版本（包括 3.5.1.38 及更早版本）中，由于输入消毒（sanitization）不足以及输出转义（escaping）缺失，存在通过“slider”区块属性导致的存储型跨站脚本攻击（Stored Cross-Site Scripting, Stored XSS）漏洞。这使得拥有贡献者（Contributor）及以上权限的已认证攻击者，能够向页面中注入任意 Web 脚本，当用户访问被注入的页面时，这些脚本将会执行。具体而言，当用户在 WordPres

CVSS 6.4 · Medium EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
nextendweb Smart Slider 3 ≤ 3.5.1.38 affected
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I. Basic Information for CVE-2026-15798

Vulnerability Information
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Vulnerability Title
Smart Slider 3 <= 3.5.1.38 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'slider' Block Attribute
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
nextendweb Smart Slider 3 0 ~ 3.5.1.38 -

II. Public POCs for CVE-2026-15798

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III. Intelligence Information for CVE-2026-15798

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Patches & Fixes for CVE-2026-15798 (4)

Proof of Concept for CVE-2026-15798 (1)

Vendor Pages for CVE-2026-15798 (2)

IV. Related Vulnerabilities

Same product: Smart Slider 3
Same vendor: nextendweb
Same weakness: CWE-79

V. Comments for CVE-2026-15798

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