EUVD-2026-67720Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Network-reachable via any HTTP request; no authentication required since Basic auth username is attacker-supplied without credentials; impact is solely log record integrity, no confidentiality or availability effect.
Primary rating from Vendor (openjs).
CVSS VectorVendor: openjs
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Log forging in morgan HTTP request logger middleware for Node.js (all versions prior to 1.12.0) allows unauthenticated remote attackers to inject Unicode line separator characters - U+0085 (Next Line), U+2028 (Line Separator), and U+2029 (Paragraph Separator) - into log output via attacker-controlled token values such as the Basic auth username surfaced through the remote-user token. This causes Unicode-aware downstream log processors and SIEM pipelines to split a single HTTP request record into multiple logical entries, enabling false log injection and audit trail manipulation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target application uses the morgan npm package for HTTP request logging and that at least one log token reflects attacker-controlled request data. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N) accurately reflects the attack surface and limited impact: any unauthenticated remote client can trigger the vulnerability with a crafted HTTP request, but the consequence is confined to log integrity - no code execution, no confidentiality breach, no availability impact. … 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 | Upgrade morgan to version 1.12.0 or later, which extends the internal token-escaping helper to cover Unicode line separator characters U+0085, U+2028, and U+2029 in addition to ASCII control characters addressed in the prior fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-117 – Improper Output Neutralization for Logs
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