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4 vulnerabilities by morgan
CVE-2026-15603 (GCVE-0-2026-15603)
Vulnerability from nvd – Published: 2026-08-28 13:41 – Updated: 2026-08-28 18:23
VLAI
EPSS
VEX
Title
morgan vulnerable to Log Forging via unescaped Unicode line separators
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-28 18:23 UTC
CWE
- CWE-117 - Improper Output Neutralization for Logs
Assigner
References
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CVE-2026-5078 (GCVE-0-2026-5078)
Vulnerability from nvd – Published: 2026-06-03 05:56 – Updated: 2026-06-03 13:19
VLAI
EPSS
VEX
Title
morgan vulnerable to Log Forging via unneutralized control characters in :remote-user
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-03 13:16 UTC
CWE
- CWE-117 - Improper Output Neutralization for Logs
Assigner
References
Impacted products
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CVE-2026-15603 (GCVE-0-2026-15603)
Vulnerability from cvelistv5 – Published: 2026-08-28 13:41 – Updated: 2026-08-28 18:23
VLAI
EPSS
VEX
Title
morgan vulnerable to Log Forging via unescaped Unicode line separators
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-28 18:23 UTC
CWE
- CWE-117 - Improper Output Neutralization for Logs
Assigner
References
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CVE-2026-5078 (GCVE-0-2026-5078)
Vulnerability from cvelistv5 – Published: 2026-06-03 05:56 – Updated: 2026-06-03 13:19
VLAI
EPSS
VEX
Title
morgan vulnerable to Log Forging via unneutralized control characters in :remote-user
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-03 13:16 UTC
CWE
- CWE-117 - Improper Output Neutralization for Logs
Assigner
References
Impacted products
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"title": "morgan vulnerable to Log Forging via unneutralized control characters in :remote-user",
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"cveMetadata": {
"assignerOrgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
"assignerShortName": "openjs",
"cveId": "CVE-2026-5078",
"datePublished": "2026-06-03T05:56:49.512Z",
"dateReserved": "2026-03-28T17:42:51.328Z",
"dateUpdated": "2026-06-03T13:19:32.922Z",
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