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9.1

IBM Sterling File Gateway lets attackers skip login

CVE-2026-75878 · published 24 days ago
Summary

IBM Sterling File Gateway can be tricked into accepting a forged single sign‑on header, allowing a remote user to log in without valid credentials. This could give an attacker full access to the system and any data it handles. Apply the latest security update from IBM and verify that only trusted sources can send SSO headers.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
ibm sterling file gateway <= 6.2.0.6_1, 6.2.1.0 - 6.2.1.2, 6.2.2.0 - 6.2.2.1
Original advisory text
IBM Sterling File Gateway is Vulnerable to Authentication Bypass
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.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker partial control
Severity
9.1 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-287Improper Authentication
Timeline
Published18 Sep 2026
Updated11 Oct 2026
First seen18 Sep 2026
Sources
CVE-2026-75878 · NVD
CVE-2026-75878 · MITRE
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