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CVE-2026-116522— Relevanssi <= 4.28.5 - Unauthenticated Stored Cross-Site Scripting via Comment Content via Late Entity Decode

Quick assessment

Affected
comesio Relevanssi – A Better Search
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 插件"Relevanssi – A Better Search"在 4.28.5 及之前的所有版本中，由于输入过滤和输出转义不足，存在通过"comment"参数触发的存储型跨站脚本（Stored XSS）漏洞。该漏洞允许未认证的攻击者在网页中注入任意 Web 脚本，这些脚本会在用户访问被注入的页面时执行。触发该漏洞需同时满足以下条件：站点必须启用“评论索引”和“评论高亮”功能，且攻击载荷仅在访客通过携带高亮查询参数的 Relevanssi 搜索结果永久链接访问单篇文章页面时才会执行。

CVSS 7.2 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-116522

Vulnerability Information
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Vulnerability Title
Relevanssi <= 4.28.5 - Unauthenticated Stored Cross-Site Scripting via Comment Content via Late Entity Decode
Source: CVE Program / CVE List V5
Vulnerability Description
The Relevanssi – A Better Search plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 4.28.5 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 site to have both the comment indexing and comment highlighting options enabled, and the payload only fires when a visitor reaches a singular page via a Relevanssi search-result permalink carrying the highlight query parameter.
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
comesio Relevanssi – A Better Search 0 ~ 4.28.5 -

II. Public POCs for CVE-2026-116522

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III. Intelligence Information for CVE-2026-116522

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Other References for CVE-2026-116522 (8)

IV. Related Vulnerabilities

Same product: Relevanssi – A Better Search
Same vendor: comesio
Same weakness: CWE-79