What is CVE-2026-75878?

CVE-2026-75878 is a critical-severity vulnerability in IBM Sterling File Gateway, classified under Improper Authentication. CVSS score: 9.1/10. Published 2026-09-18.

How severe is CVE-2026-75878?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Auth bypass in IBM Sterling File Gateway

CVE-2026-75878

IBM Sterling File Gateway could allow a remote attacker to bypass authentication and obtain a fully authenticated session due to improper authentication via an unvalidated SSO header.

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Ibm Sterling File Gateway

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

psirt@us.ibm.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-75878?: CVE-2026-75878 is a critical-severity vulnerability in IBM Sterling File Gateway, classified under Improper Authentication. CVSS score: 9.1/10. Published 2026-09-18.
How severe is CVE-2026-75878?: Critical severity. CVSS v3 base score is 9.1 out of 10.