CVE-2025-27801
Stored Cross-Site Scripting in Episerver Content Management System (CMS) Media Selection Preview
- State
- Published
- Severity
- 4.6 Medium
- Published
- Jul 28, 2025
- Updated
- Nov 3, 2025
- Reserved
- Mar 7, 2025
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)
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 4.6 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:L/VA:L/SC:L/SI:L/SA:N | SEC-VLab |
| 3.1 | 4.8 Medium | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N | SEC-VLab |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
Episerver Content Management System (CMS)Optimizely |
|
References
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