CVE Details
Basic Information
| Title | Stored Cross-Site Scripting in Episerver Content Management System (CMS) Media Selection Preview |
|---|---|
| Type | cve |
| Published | 2025-07-28T08:40:15.815Z |
| Modified | 2025-07-28T08:48:57.123Z |
Product Information
| Vendor | Optimizely |
|---|---|
| Product | Episerver Content Management System (CMS) |
| Version | 11.x |
CVSS Information
| Base Score | 4.6 (MEDIUM) |
|---|---|
| Attack Vector | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N |
AI Analysis
| AI Description | The Episerver Content Management System (CMS) by Optimizely is vulnerable to Stored Cross-Site Scripting (XSS) attacks. This allows authenticated attackers with the ‘WebEditor’ role to execute malicious JavaScript by uploading SVG files with embedded scripts. The vulnerability affects versions 11.x and 12.x of the CMS. |
|---|---|
| AI Severity | High |
| AI Vendor | Optimizely |
| AI Product | Episerver Content Management System (CMS) |
| AI Version | 11.x, 12.x |
Affected Products
- Optimizely Episerver Content Management System (CMS) 11.x
- Optimizely Episerver Content Management System (CMS) 12.x
Additional Information
| CWE List | CWE-79 |
|---|---|
| Source | SEC-VLab |
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)