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CVE-2026-19985— Relevanssi <= 4.28.1 - Reflected Cross-Site Scripting

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 Relevanssi是WordPress基金会开源的一款优化站内搜索体验的CMS插件。 WordPress Relevanssi 4.28.1及之前版本存在跨站脚本漏洞，该漏洞源于lib/debug.php中relevanssi_debug_array()函数对输入清理和输出转义不当，通过's'、'post_types'和'orderby'请求参数将用户提供的查询变量经print_r()输出到<pre>块中且未进行HTML转义，可能导致未经身份验证的攻击者注入任意Web脚本。

CVSS 6.1 · Medium EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
comesio Relevanssi – A Better Search ≤ 4.28.1 affected
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I. Basic Information for CVE-2026-19985

Vulnerability Information
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Vulnerability Title
Relevanssi <= 4.28.1 - Reflected Cross-Site Scripting
Source: CVE Program / CVE List V5
Vulnerability Description
The Relevanssi – A Better Search plugin for WordPress is vulnerable to Reflected Cross-Site Scripting in versions up to, and including, 4.28.1 via the 's', 'post_types', and 'orderby' request parameters. This is due to insufficient input sanitization and output escaping in the relevanssi_debug_array() function in lib/debug.php, which dumps user-supplied query variables through print_r() inside a <pre> block without HTML escaping. The debug path is enabled by supplying the relevanssi_debug=on request parameter when the administrator has previously enabled the 'Debugging mode' setting; the gate itself is a configuration check with no capability, nonce, or logged-in check (the vendor explicitly suppresses nonce verification on that line). This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a specially crafted link.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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
Vulnerability Title
WordPress Relevanssi 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Relevanssi是WordPress基金会开源的一款优化站内搜索体验的CMS插件。 WordPress Relevanssi 4.28.1及之前版本存在跨站脚本漏洞，该漏洞源于lib/debug.php中relevanssi_debug_array()函数对输入清理和输出转义不当，通过's'、'post_types'和'orderby'请求参数将用户提供的查询变量经print_r()输出到<pre>块中且未进行HTML转义，可能导致未经身份验证的攻击者注入任意Web脚本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
comesio Relevanssi – A Better Search 0 ~ 4.28.1 -

II. Public POCs for CVE-2026-19985

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III. Intelligence Information for CVE-2026-19985

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Patches & Fixes for CVE-2026-19985 (1)

Proof of Concept for CVE-2026-19985 (1)

Security Blog Posts for CVE-2026-19985 (1)

Vendor Pages for CVE-2026-19985 (2)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-19985

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