CVE-2026-75878 IBM Sterling File Gateway - Authentication Bypass

IBM Sterling File Gateway contains an authentication bypass caused by improper validation of SSO header, letting remote attackers obtain fully authenticated sessions, exploit requires crafted SSO header.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.64% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
18 September 2026
Updated
15 October 2026
Weakness
CWE-287

Vendor fix

Update to the latest version with proper SSO header validation.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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