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CVE-2026-27621— TypiCMS Core has Stored Cross-Site Scripting (XSS) via SVG File Upload

Quick assessment

Affected
TypiCMS Core
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.

TypiCMS是TypiCMS开源的一个内容管理系统。 TypiCMS 16.1.7之前版本存在跨站脚本漏洞，该漏洞源于文件上传模块未清理SVG文件内容，可能导致存储型跨站脚本攻击。

AI Predicted 5.4 Difficulty: Easy EPSS 0.27% · P18
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I. Basic Information for CVE-2026-27621

Vulnerability Information
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Vulnerability Title
TypiCMS Core has Stored Cross-Site Scripting (XSS) via SVG File Upload
Source: CVE Program / CVE List V5
Vulnerability Description
TypiCMS is a multilingual content management system based on the Laravel framework. A Stored Cross-Site Scripting (XSS) vulnerability exists in the file upload module of TypiCMS prior to version 16.1.7. The application allows users with file upload permissions to upload SVG files. While there is a MIME type validation, the content of the SVG file is not sanitized. An attacker can upload a specially crafted SVG file containing malicious JavaScript code. When another user (such as an administrator) views or accesses this file through the application, the script executes in their browser, leading to a compromise of that user's session. The issue is exacerbated by a bug in the SVG parsing logic, which can cause a 500 error if the uploaded SVG does not contain a `viewBox` attribute. However, this does not mitigate the XSS vulnerability, as an attacker can easily include a valid `viewBox` attribute in their malicious payload. Version 16.1.7 of TypiCMS Core fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/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
TypiCMS 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TypiCMS是TypiCMS开源的一个内容管理系统。 TypiCMS 16.1.7之前版本存在跨站脚本漏洞，该漏洞源于文件上传模块未清理SVG文件内容，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
TypiCMS Core < 16.1.7 -

II. Public POCs for CVE-2026-27621

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III. Intelligence Information for CVE-2026-27621

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Vendor Advisories for CVE-2026-27621 (1)

IV. Related Vulnerabilities

Same product: Core
Same weakness: CWE-79

V. Comments for CVE-2026-27621

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