IBM i Improper Authentication

published 2026-10-20 19 d ago modified 2026-10-21 18 d ago also EUVD-2026-106858

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits: 0; none known

IBM i 7.3, 7.4, 7.5, and 7.6 could allow an unathenticated remote attacker to bypass security restrictions due to improper access control. By sending a specially crafted HTTP request to any URL within the Navigator application prior to authentication, a bad actor could exploit this vulnerability to alter server-side session security state.

Patch / fix

links 1

ibm.com/support/pages/node/7292223 advisory

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 18 d ago (2026-10-21)

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected products

IBM i

Classification

Weakness

CWE-287 Improper Authentication

References

ibm.com /support/pages/node/7292223
vendor-advisory, patch

Sources

CVE List CVE-2026-93744
NVD CVE-2026-93744

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Summary