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CVE-2025-27801— Stored Cross-Site Scripting in Episerver Content Management System (CMS) Media Selection Preview

CVSS 4.8 · Medium EPSS 0.06% · P17
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I. Basic Information for CVE-2025-27801

Vulnerability Information
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Vulnerability Title
Stored Cross-Site Scripting in Episerver Content Management System (CMS) Media Selection Preview
Source: NVD (National Vulnerability Database)
Vulnerability Description
The Episerver Content Management System (CMS) by Optimizely was affected by multiple Stored Cross-Site Scripting (XSS) vulnerabilities. This allowed an authenticated attacker to execute malicious JavaScript code in the victim's browser. ContentReference properties, which could be used in the "Edit" section of the CMS, offered an upload functionality for documents. These documents could later be used as displayed content on the page. It was possible to upload SVG files that include malicious JavaScript code that would be executed if a user visited the direct URL of the preview image. Attackers needed at least the role "WebEditor" in order to exploit this issue. Affected products: Version 11.X: EPiServer.CMS.Core (<11.21.4) with EPiServer.CMS.UI (<11.37.5), Version 12.X: EPiServer.CMS.Core (<12.22.1) with EPiServer.CMS.UI (<11.37.3)
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
Vulnerability Title
Optimizely Episerver Content Management System 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Optimizely Episerver Content Management System是美国Optimizely公司的一个企业级内容管理系统。 Optimizely Episerver Content Management System存在安全漏洞，该漏洞源于存储型跨站脚本使经过身份验证的攻击者能执行恶意JavaScript代码。
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

VendorProductAffected VersionsCPESubscribe
OptimizelyEpiserver Content Management System (CMS) 11.x ~ 11.21.4 -

II. Public POCs for CVE-2025-27801

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III. Intelligence Information for CVE-2025-27801

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Same Patch Batch · Optimizely · 2025-07-28 · 3 CVEs total

CVE-2025-278004.8 MEDIUMStored Cross-Site Scripting in Episerver Content Management System (CMS) Admin Dashboard
CVE-2025-278024.8 MEDIUMStored Cross-Site Scripting in Episerver Content Management System (CMS) Edit Preview

IV. Related Vulnerabilities

Same product: Episerver Content Management System (CMS)
Same vendor: Optimizely
Same weakness: CWE-79

V. Comments for CVE-2025-27801

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