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CVE-2026-24906— October CMS has Stored XSS in its Backend Editor Markup Classes

Quick assessment

Affected
octobercms october
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.

October是October开源的一个内容管理系统 (CMS) 和网络平台。 October 3.7.14之前版本和4.1.10之前版本存在跨站脚本漏洞，该漏洞源于后端编辑器设置中的标记类字段输入清理不当，可能导致存储型跨站脚本攻击。

AI Predicted 8.2 Difficulty: Easy EPSS 0.25% · P15
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I. Basic Information for CVE-2026-24906

Vulnerability Information
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Vulnerability Title
October CMS has Stored XSS in its Backend Editor Markup Classes
Source: CVE Program / CVE List V5
Vulnerability Description
October is a Content Management System (CMS) and web platform. Versions prior to 3.7.14 and 4.1.10 contain a Stored Cross-Site Scripting (XSS) vulnerability in the Backend Editor Settings. The Markup Classes fields (used for paragraph styles, inline styles, table styles, etc.) did not sanitize input to valid CSS class name characters. Malicious values were rendered unsanitized in Froala editor dropdown menus, allowing JavaScript execution when any user opened a RichEditor. Exploitation could lead to privilege escalation if a superuser opens any RichEditor during routine content editing (e.g., editing a blog post), and requires authenticated backend access with editor settings permissions. This issue has been fixed in versions 3.7.14 and 4.1.10. To workaround this issue, restrict editor settings permissions to fully trusted administrators only
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA: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
October 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
October是October开源的一个内容管理系统 (CMS) 和网络平台。 October 3.7.14之前版本和4.1.10之前版本存在跨站脚本漏洞，该漏洞源于后端编辑器设置中的标记类字段输入清理不当，可能导致存储型跨站脚本攻击。
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
octobercms october < 3.7.14 -

II. Public POCs for CVE-2026-24906

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III. Intelligence Information for CVE-2026-24906

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Same Patch Batch · octobercms · 2026-04-14 · 5 CVEs total

CVE-2026-25125 4.9 MEDIUM October CMS: Environment Variable Exfiltration via INI Parser Interpolation
CVE-2026-22692 4.9 MEDIUM October CMS: Twig Sandbox Bypass via Collection Methods
CVE-2026-25133 October CMS has Stored XSS via SVG Filter Bypass
CVE-2026-24907 October CMS has Stored XSS via Event Log Mail Preview

IV. Related Vulnerabilities

Same product: october
Same vendor: octobercms
Same weakness: CWE-79

V. Comments for CVE-2026-24906

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