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9.9

IBM AIX 7.2/7.3 and PowerVM VIOS 4.1 let logged‑in attackers run commands

CVE-2026-18835 · published 14 days ago
Summary

If someone who already has a user account on these IBM server operating systems sends specially crafted input, they can cause the system to run any command they choose. This could let an attacker take control of the server or access data they shouldn’t see. Apply the latest vendor patches or updates as soon as possible and ensure only trusted users have login access.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
ibm aix 7.2
ibm powervm vios 4.1
Original advisory text
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote authenticated attacker to execute arbitrary commands due to improper neutralization of special elements used in an OS command.
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote authenticated attacker to execute arbitrary commands due to improper neutralization of special elements used in an OS command.
References
Severity
9.9 Critical
CVSS 3.1: 9.9 (NVD)
Exploitation
EPSS <1%
Type
CWE-78OS Command Injection
Timeline
Published20 Aug 2026
Updated3 Sep 2026
First seen20 Aug 2026
Sources
CVE-2026-18835 · NVD
CVE-2026-18835 · MITRE
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