Improper Output Neutralization for Logs in morgan - CVE-2026-15603

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Main Vulnerability Database Vulnerabilities #VU146052

Improper Output Neutralization for Logs in morgan - CVE-2026-15603

Published: August 28, 2026


Vulnerability identifier: #VU146052
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-15603
CWE-ID: CWE-117
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to forge log entries.

The vulnerability exists due to improper output neutralization for logs in morgan access log token handling when logging attacker-controlled request data. A remote attacker can send crafted request values containing Unicode line separators to forge log entries.

The issue affects built-in formats including combined, common, default, and short, as well as custom formats. Downstream ECMAScript-aware or Unicode-aware log processing can split a single physical log record into multiple logical records.


Affected software

morgan
PowerVC
Maximo Application Suite - Monitor Component

How to mitigate CVE-2026-15603

Install security update from vendor's website.

morgan - update to 1.12.0
Maximo Application Suite - Monitor Component - addressed in versions 9.0.25, 9.1.15, 9.2.4

External References

Related Security Bulletins