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CVE-2026-120552— SEO Engine <= 0.9.9 - Authenticated (Contributor+) Stored Cross-Site Scripting via Entity-Encoded Post Title via Strip-then-Decode in build_title()

Quick assessment

Affected
tigroumeow SEO Engine – Smart SEO with AI, Schema & Redirection for WordPress
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"The SEO Engine – Smart SEO with AI, Schema & Redirection for WordPress"在 0.9.9 及之前所有版本中存在存储型跨站脚本（Stored XSS）漏洞。该漏洞源于对"title"参数输入清理不足以及输出转义缺失。拥有贡献者（Contributor）及以上权限的已认证攻击者，可利用此漏洞在页面中注入任意 Web 脚本，当用户访问被注入的页面时，脚本即会被执行。 虽然 WordPress 核心通过 钩子对贡献者和作者应用了

CVSS 6.4 · Medium

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
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I. Basic Information for CVE-2026-120552

Vulnerability Information
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Vulnerability Title
SEO Engine <= 0.9.9 - Authenticated (Contributor+) Stored Cross-Site Scripting via Entity-Encoded Post Title via Strip-then-Decode in build_title()
Source: CVE Program / CVE List V5
Vulnerability Description
The SEO Engine – Smart SEO with AI, Schema & Redirection for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'title' parameter in all versions up to, and including, 0.9.9 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. WordPress core's wp_filter_kses (applied via title_save_pre for Contributors and Authors) strips literal tag markup on save but leaves HTML-entity-encoded payloads intact in the database, meaning entity-encoded XSS payloads stored via the standard WordPress REST API (POST /wp-json/wp/v2/posts) are not neutralized before reaching the vulnerable sink.
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
tigroumeow SEO Engine – Smart SEO with AI, Schema & Redirection for WordPress 0 ~ 0.9.9 -

II. Public POCs for CVE-2026-120552

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III. Intelligence Information for CVE-2026-120552

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Other References for CVE-2026-120552 (7)

IV. Related Vulnerabilities

Same vendor: tigroumeow
Same weakness: CWE-79