SB2026082834 - Improper Output Neutralization for Logs in morgan

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Main Vulnerability Database SB2026082834

SB2026082834 - Improper Output Neutralization for Logs in morgan

Published: August 28, 2026

Security Bulletin ID SB2026082834
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Output Neutralization for Logs (CVE-ID: CVE-2026-15603)

CWE-ID: CWE-117 - Improper Output Neutralization for Logs

CVSSv4: 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]


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.


Remediation

Install update from vendor's website.

References