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.
CVE-2026-75878
CRITICALPre-NVD 9.19.1—Trending — 3 sources updated this week
EchelonGraph scoreHIGH confidence
Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-18. a secondary CVSS source baseline 9.1; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 9.1Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.1
- EG Score
- 9.1(high)
- EG Risk
- 45(Track)EG Risk 45/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity91% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- Not listed
Published
September 18, 2026
Last Modified
September 18, 2026
Advisory Details (1)
Auto-updated Sep 18, 2026No patch confirmed yet.
generic
Security Bulletin: IBM Sterling File Gateway is Vulnerable to Authentication Bypass (CVE-2026-75878)
https://www.ibm.com/support/pages/node/7287497Vendor Advisories for CVE-2026-75878(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 6× in last 7d / 6× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-09-19 05:15 UTCGHSA enrichment
- 2026-09-19 00:54 UTCEG score recompute
- 2026-09-19 00:53 UTCGHSA enrichment
- 2026-09-18 20:31 UTCEG score recompute
- 2026-09-18 19:29 UTCEG score recompute
- 2026-09-18 19:29 UTCMITRE cvelistV5first tracked
Frequently asked(4)
What is CVE-2026-75878?
CVE-2026-75878 is a critical vulnerability published on September 18, 2026. 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.
When was CVE-2026-75878 disclosed?
CVE-2026-75878 was first published in the National Vulnerability Database on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-75878?
CVE-2026-75878 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-75878?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-75878, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-75878
Is Your Infrastructure Affected by CVE-2026-75878?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.