# CVE-2025-27800: Stored Cross-Site Scripting in Episerver Content Management System (CMS) Admin Dashboard

> CVE-2025-27800: Stored Cross-Site Scripting in Episerver Content Management System (CMS) Admin Dashboard. CVSS 4.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-27800
Last updated: 2026-06-17T09:04:14Z

- Published: 2025-07-28 08:33 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: 0.38%, 31th 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. The Admin dashboard offered the functionality to add gadgets to the dashboard. This included the "Notes" gadget. An authenticated attacker with the corresponding access rights (such as "WebAdmin") that was impersonating the victim could insert malicious JavaScript code in these notes that would be executed if the victim visited the dashboard. 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-2025-27800)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-27800)
- [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-2025-27800 · Markdown: https://rewindex.com/cve/CVE-2025-27800.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-27800 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:15:34.760Z