EUVD-2026-76027Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Network-accessible with no auth or user interaction required; integrity impact is low (log field manipulation only) with no confidentiality or availability impact.
Primary rating from Vendor (openjs).
CVSS VectorVendor: openjs
Lifecycle Timeline
4DescriptionCVE.org
morgan is an HTTP request logger middleware for Node.js. In versions before 1.12.1, its escapeLogField() function does not escape the double quote character, which delimits the quoted fields of the Apache combined log format that morgan emits. An unauthenticated remote attacker who controls a value written to a quoted field, such as the User-Agent or Referer header, can include a double quote to close that field early, so a log consumer that parses the log by field position reads attacker-supplied text as the following field. In the built-in formats this makes the recorded value differ from the value that was sent, and in custom formats that quote an attacker-controlled token before a server-controlled one it can forge values such as the response status. No newline is injected, so record separation stays intact. The issue is fixed in morgan 1.12.1, which escapes the double quote. Users should upgrade to morgan 1.12.1 or later.
AnalysisAI
Log field injection in morgan, the Node.js HTTP request logger middleware, before version 1.12.1 allows unauthenticated remote attackers to manipulate parsed log records by embedding unescaped double quotes in HTTP headers such as User-Agent or Referer. The escapeLogField() function failed to escape the double-quote character, which serves as a field delimiter in the Apache combined log format that morgan emits by default, enabling a downstream log consumer that parses by field position to read attacker-supplied text as a subsequent field. …
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Attack ChainAIDerived
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Vulnerability AssessmentAI
| Exploitation | No authentication is required - any HTTP client that can reach the application can send a crafted request. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N) correctly classifies this as a moderate, integrity-only issue requiring no authentication. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: morgan 1.12.1. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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