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CVE-2026-15603— morgan vulnerable to Log Forging via unescaped Unicode line separators

Quick assessment

Affected
morgan morgan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

摩根（morgan）是 Node.js 的一个 HTTP 请求日志记录中间件。在 1.12.0 之前的版本中，用于转义日志令牌（token）值的内部辅助函数未能中和 Unicode 换行分隔符字符：U+0085（下一行）、U+2028（行分隔符）和 U+2029（段落分隔符）。 未经身份验证的远程客户端可以在攻击者可控的日志令牌（例如通过 令牌暴露的 Basic 认证用户名）中插入这些字符，从而使支持 Unicode 的下游日志处理系统将单条请求日志拆分为多条逻辑记录。 这是一个日志伪造问题（CWE-117），是

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
morgan morgan < 1.12.0 affected
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I. Basic Information for CVE-2026-15603

Vulnerability Information
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Vulnerability Title
morgan vulnerable to Log Forging via unescaped Unicode line separators
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
日志输出的转义处理不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
morgan morgan 0 ~ 1.12.0 -

II. Public POCs for CVE-2026-15603

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III. Intelligence Information for CVE-2026-15603

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Vendor Advisories for CVE-2026-15603 (1)

IV. Related Vulnerabilities

Same product: morgan
Same vendor: morgan
Same weakness: CWE-117

V. Comments for CVE-2026-15603

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