What is CVE-2026-77153?

CVE-2026-77153 is a medium-severity vulnerability in IBM I, classified under Missing Authorization. CVSS score: 4.8/10. Published 2026-11-08.

How severe is CVE-2026-77153?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Auth bypass in IBM I

CVE-2026-77153

IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote unauthenticated attacker to obtain sensitive information from the Host-Based Printer Subsystem due to no authorization check. A bad actor could use this vulnerability to print files they should not be able to access.

Vulnerability class: Broken Access Control

Published 2026-11-08 · last modified 2026-11-08.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

IBM I — versions 7.3, 7.4, 7.5

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

www.ibm.com/support/pages/node/7294253 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-77153?: CVE-2026-77153 is a medium-severity vulnerability in IBM I, classified under Missing Authorization. CVSS score: 4.8/10. Published 2026-11-08.
How severe is CVE-2026-77153?: Medium severity. CVSS v3 base score is 4.8 out of 10.