IBM Sterling File Gateway is Vulnerable to Authentication Bypass

published 2026-09-18 51 d ago modified 2026-09-22 47 d ago also EUVD-2026-83300

cvss: 9.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 51%
public exploits: 0; none known

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.

Patch / fix

links 1

ibm.com/support/pages/node/7287497 advisory

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 51 d ago (2026-09-19)

Exploit prediction

0.64% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.1	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

Classification

Weakness

CWE-287 Improper Authentication

References

ibm.com /support/pages/node/7287497
vendor-advisory, patch

Sources

CVE List CVE-2026-75878
NVD CVE-2026-75878

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary