CVE-2026-75878 IBM Sterling File Gateway is Vulnerable to Authentication Bypass
Remote attackers can bypass authentication via an unvalidated SSO header to gain full access to IBM Sterling File Gateway sessions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-75878?
CVE-2026-75878 is a critical authentication bypass vulnerability in IBM Sterling File Gateway, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-287
Which versions are affected by CVE-2026-75878?
How do I fix CVE-2026-75878?
No fix has been published for CVE-2026-75878 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-75878 being exploited?
There is no known exploitation of CVE-2026-75878 in the wild and no public exploit code.
Sources
Also known as GHSA-652p-cfff-8crm.