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. RTE properties (text fields), which could be used in the "Edit" section of the CMS, allowed the input of arbitrary text. It was possible to input malicious JavaScript code in these properties that would be executed if a user visits the previewed page. 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)
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://api.nuget.optimizely.com/packages/episerver.cms.core/11.21.4#
- https://api.nuget.optimizely.com/packages/episerver.cms.core/12.22.1#
- https://r.sec-consult.com/optimizely
- http://seclists.org/fulldisclosure/2025/Aug/18
FAQ
What is CVE-2025-27802?
CVE-2025-27802 is a vulnerability with a CVSS score of 4.8 (MEDIUM). 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 Java...
How severe is CVE-2025-27802?
CVE-2025-27802 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-27802?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.