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NVD description
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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
🚨 Medium-severity security fix in morgan@1.12.0 just released! Patches CVE-2026-15603: morgan vulnerable to log forging via unescaped Unicode line separators https://github.com/expressjs/morgan/security/advisories/GHSA-jxfw-x594-9x9m
Post summary
A medium‑severity CVE (CVE‑2026‑15603) affecting morgan 1.12.0 has been fixed, addressing a log forging vulnerability caused by unescaped Unicode line separators.
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | morgan_project | morgan | - | node.js | - |