Vulnerability in Linux Entra SSO Browser Plugin for Chrome
CVE-2026-42177

5.3MEDIUM

Key Information:

Vendor

Siemens
Status
Linux-entra-sso
Vendor
CVE Published:
12 May 2026

What is CVE-2026-42177?

The linux-entra-sso browser plugin for Linux is affected by an improper input validation issue in versions prior to 1.8.1. The vulnerability resides in how the Chrome adapter handles network requests with broad host permissions. Specifically, a single declarativeNetRequest rule leads to unintended inclusion of a sensitive cookie (PRT) when a user navigates to URLs containing 'https://login.microsoftonline.com/'. While Firefox has a precautionary check in place, the absence of such a safeguard in Chrome permits the exposure of the token to potentially malicious sites. This issue has been rectified in version 1.8.1.

Affected Version(s)

linux-entra-sso < 1.8.1

References

https://github.com/siemens/linux-entra-sso/security/advis...
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CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.