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CVE-2026-25133— October CMS has Stored XSS via SVG Filter Bypass

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SVG清理逻辑中的正则表达式模式可被绕过，可能导致存储型跨站脚本攻击。

AI Predicted 8.1 Difficulty: Easy EPSS 0.22% · P12
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I. Basic Information for CVE-2026-25133

Vulnerability Information
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Vulnerability Title
October CMS has Stored XSS via SVG Filter Bypass
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 SVG sanitization logic. The regex pattern used to strip event handler attributes (such as onclick or onload) could be bypassed using a crafted payload that exploits how the pattern matches attribute boundaries, allowing malicious SVG files to be uploaded through the Media Manager with embedded JavaScript. Exploitation could lead to privilege escalation if a superuser views or embeds the malicious SVG, and requires authenticated backend access with media upload permissions. The SVG must be viewed or embedded in a page for the payload to trigger. This issue has been fixed in versions 3.7.14 and 4.1.10.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/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SVG清理逻辑中的正则表达式模式可被绕过，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-2026-25133

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III. Intelligence Information for CVE-2026-25133

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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-2026-24906 October CMS has Stored XSS in its Backend Editor Markup Classes
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-2026-25133

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