Morgan Project: >> Morgan >> 1.0.0 Security Vulnerabilities
morgan is an HTTP request logger middleware for Node.js. In versions prior to 1.12.0, the internal helper that escapes log token values did not neutralize the Unicode line separator characters U+0085 (Next Line), U+2028 (Line Separator), and U+2029 (Paragraph Separator). An unauthenticated remote client can place these characters in an attacker-controlled log token, for example a Basic auth username surfaced through the remote-user token, so that Unicode-aware downstream log processing splits a single request log into multiple logical records. This is a log forging issue (CWE-117) and an incomplete-fix follow-up to CVE-2026-5078, which only addressed ASCII control characters. The issue is fixed in morgan 1.12.0, which extends the escaping set to cover these Unicode line separators. Upgrade to morgan 1.12.0 to remediate.
CVSS Score
5.3
EPSS Score
0.002
Published
2026-08-28
An attacker can use the format parameter to inject arbitrary commands in the npm package morgan < 1.9.1.
CVSS Score
9.8
EPSS Score
0.034
Published
2019-03-21