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CVE-2026-17577— SSL Zen <= 4.7.42 - Reflected Cross-Site Scripting via 'uri' Parameter

Quick assessment

Affected
sslzen SSL Zen — SSL Certificate Installer & HTTPS Redirects
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 SSL Zen 插件存在反射型跨站脚本漏洞，该漏洞出现在 4.7.42 及之前版本，源于对 'uri'（以及 'host'）参数的处理不当。ssl_zen_messages::getMessages() 函数通过 base64_decode(sanitize_text_field($_REQUEST['uri'])) 以及（可选地）base64_decode(sanitize_text_field($_REQUEST['host'])) 来构建 "token_missmatch" 消息。然而

CVSS 6.1 · Medium EPSS 0.27% · P18

Affected Version Matrix 1

VendorProduct Version RangeStatus
sslzen SSL Zen — SSL Certificate Installer & HTTPS Redirects ≤ 4.7.42 affected
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I. Basic Information for CVE-2026-17577

Vulnerability Information
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Vulnerability Title
SSL Zen <= 4.7.42 - Reflected Cross-Site Scripting via 'uri' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The SSL Zen plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'uri' (and 'host') parameters in versions up to, and including, 4.7.42. The ssl_zen_messages::getMessages() function builds the 'token_missmatch' message using base64_decode(sanitize_text_field($_REQUEST['uri'])) and (optionally) base64_decode(sanitize_text_field($_REQUEST['host'])). sanitize_text_field() cannot strip HTML/JavaScript that is hidden inside a base64-encoded blob, and the resulting decoded raw HTML is echoed unescaped by showMessage() . 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

Affected Products

Vendor Product Affected Versions CPE Subscribe
sslzen SSL Zen — SSL Certificate Installer & HTTPS Redirects 0 ~ 4.7.42 -

II. Public POCs for CVE-2026-17577

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III. Intelligence Information for CVE-2026-17577

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Patches & Fixes for CVE-2026-17577 (1)

Vendor Advisories for CVE-2026-17577 (1)

Vendor Pages for CVE-2026-17577 (1)

IV. Related Vulnerabilities

Same product: SSL Zen — SSL Certificate Installer & HTTPS Redirects
Same vendor: sslzen
Same weakness: CWE-79

V. Comments for CVE-2026-17577

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