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CVE-2026-103426— Relevanssi Premium <= 2.31.4 - Unauthenticated Stored Cross-Site Scripting via '_rt' Parameter

Quick assessment

Affected
Relevanssi Relevanssi Premium
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 Relevanssi Premium 插件在 2.31.4 及更早版本中存在存储型跨站脚本（Stored Cross-Site Scripting, XSS）漏洞。该漏洞源于插件对 “_rt” 参数的输入清理和输出转义处理不足。攻击者无需身份验证即可在网页中注入任意 Web 脚本，当其他用户访问包含这些脚本的页面时，脚本将被执行。 要利用此漏洞，必须在插件设置中启用点击追踪和日志记录功能。由于每次搜索结果页面都会公开暴露有效的 值，未授权用户可轻易构造恶意请求，使漏洞利用变得极为简单。

CVSS 7.2 · High EPSS 0.23% · P13

Affected Version Matrix 1

VendorProduct Version RangeStatus
Relevanssi Relevanssi Premium ≤ 2.31.4 affected
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I. Basic Information for CVE-2026-103426

Vulnerability Information
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Vulnerability Title
Relevanssi Premium <= 2.31.4 - Unauthenticated Stored Cross-Site Scripting via '_rt' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Relevanssi Premium plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the '_rt' parameter in all versions up to, and including, 2.31.4 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the click-tracking and logging feature to be activated in the plugin settings, and exploitation is trivially accessible to unauthenticated users because a valid _rt_nonce is publicly emitted on every search-results page.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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
Relevanssi Relevanssi Premium 0 ~ 2.31.4 -

II. Public POCs for CVE-2026-103426

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-103426

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Vendor Advisories for CVE-2026-103426 (1)

Other References for CVE-2026-103426 (1)

IV. Related Vulnerabilities

Same product: Relevanssi Premium
Same vendor: Relevanssi
Same weakness: CWE-79

V. Comments for CVE-2026-103426

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