What is CVE-2026-42177?

CVE-2026-42177 is a medium-severity vulnerability in Siemens Linux-entra-sso, classified under Improper Access Control. CVSS score: 5.3/10. Published 2026-05-12.

How severe is CVE-2026-42177?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Siemens Linux-entra-sso

CVE-2026-42177

linux-entra-sso is a browser plugin for Linux to SSO on Microsoft Entra ID. Prior to 1.8.1, platform/chrome/js/platform-chrome.js:69-88 registers a single declarativeNetRequest rule whose urlFilter is Platform.SSO_URL + "/*", i.e. "https:/…

EPSS: 0.000 (10.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Siemens Linux-entra-sso — versions < 1.8.1

Weakness classification (CWE)

CWE-284 — Improper Access Control
CWE-436

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-42177?: CVE-2026-42177 is a medium-severity vulnerability in Siemens Linux-entra-sso, classified under Improper Access Control. CVSS score: 5.3/10. Published 2026-05-12.
How severe is CVE-2026-42177?: Medium severity. CVSS v3 base score is 5.3 out of 10.