---
id: CVE-2026-75878
title: >-
  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.
summary: >-
  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.
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-287
vendor: IBM
product: Sterling File Gateway
affected:
  - >-
    sterling_file_gateway >= 6.2.0.0 <= 6.2.0.6_1, 6.2.1.0 - 6.2.1.2, 6.2.2.0 -
    6.2.2.1
published: '2026-09-18'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T19:32:25.730'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75878'
references:
  - url: 'https://www.ibm.com/support/pages/node/7287497'
    label: psirt@us.ibm.com
tags:
  - nvd
  - cve.org
epss: 0.00644
epssPercentile: 0.48686
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-19T13:37:06.804390Z'
ingestedAt: '2026-09-18T19:49:30.594Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.