CVE-2026-5078

Published: Giu 03, 2026 Last Modified: Giu 03, 2026
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 5,3
Source: ce714d77-add3-4f53-aff5-83d477b104bb
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: low
Availability: none

Description

AI Translation Available

Impact: The morgan logging middleware's :remote-user token extracts the Basic auth username from the Authorization request header and writes it to the log stream without neutralizing control characters. An unauthenticated attacker can send a crafted Authorization Basic header containing CR or LF bytes to inject forged log lines, breaking the one-request-per-line structure of access logs and enabling log forgery against downstream log consumers. The built-in combined, common, default, and short formats are affected, as well as any custom format that references :remote-user. Affected versions: morgan 1.2.0 through 1.10.1. Patches: upgrade to morgan 1.11.0, which neutralizes control characters in the :remote-user token output. Workarounds: use a custom format string that does not include :remote-user.

117

Improper Output Neutralization for Logs

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Integrity Confidentiality Availability Non-Repudiation
Potential Impacts:
Modify Application Data Hide Activities Execute Unauthorized Code Or Commands
Applicable Platforms
All platforms may be affected
Likelihood of Exploit: Medium
View CWE Details
https://cna.openjsf.org/security-advisories.html
https://cna.openjsf.org/security-advisories.html
https://github.com/expressjs/morgan/security/advisories/GHS…
https://github.com/expressjs/morgan/security/advisories/GHSA-4vj7-5mj6-jm8m