# CVE-2025-27802: Stored Cross-Site Scripting in Episerver Content Management System (CMS) Edit Preview

> CVE-2025-27802: Stored Cross-Site Scripting in Episerver Content Management System (CMS) Edit Preview. CVSS 4.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-27802
Last updated: 2026-06-17T09:04:14Z

- Published: 2025-07-28 08:47 UTC · Updated: 2026-06-17 09:04 UTC · Assigner: SEC-VLab
- CVSS: 4.8 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
- EPSS: 0.34%, 27th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-79

## 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)

## Affected vendors and products

- Optimizely: Episerver Content Management System (CMS)

## Tracked companies

- [Optimizely](https://rewindex.com/company/optimizely.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-27802)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-27802)
- [https://api.nuget.optimizely.com/packages/episerver.cms.core/11.21.4\#](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://api.nuget.optimizely.com/packages/episerver.cms.core/12.22.1#)
- [https://r.sec-consult.com/optimizely](https://r.sec-consult.com/optimizely)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-27802 · Markdown: https://rewindex.com/cve/CVE-2025-27802.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-27802 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:06:19.611Z