CVE-2025-27800

July 29, 2025, 2:14 p.m.

4.8
Medium

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)

Product(s) Impacted

Vendor Product Versions
Optimizely
  • Episerver Cms
  • Episerver Cms Ui
  • 11.0-11.21.4, 12.0-12.22.1
  • <11.37.5, <11.37.3

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a optimizely episerver_cms 11.0-11.21.4 / / / / / / /
a optimizely episerver_cms 12.0-12.22.1 / / / / / / /
a optimizely episerver_cms_ui <11.37.5 / / / / / /
a optimizely episerver_cms_ui <11.37.3 / / / / / /

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

Tags

CWE-79
551230f0-3615-47bd-b7cc-93e92e730bbf
2025-07-28
CVE-2025-27800

CVSS Score

4.8 / 10

CVSS Data - 4.0

  • Attack Vector: NETWORK
  • Attack Complexity: LOW
  • Attack Requirements: NONE
  • Privileges Required: HIGH
  • User Interaction: PASSIVE
  • Scope:
  • Confidentiality Impact: NONE
  • Integrity Impact: NONE
  • Availability Impact: NONE
  • Exploit Maturity: NOT_DEFINED

    • CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

    View Vector String

Timeline

Published: July 28, 2025, 9:15 a.m.
Last Modified: July 29, 2025, 2:14 p.m.

Status : Awaiting Analysis

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

551230f0-3615-47bd-b7cc-93e92e730bbf

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.