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CVE-2026-5078— morgan vulnerable to Log Forging via unneutralized control characters in :remote-user

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.

morgan是expressjs开源的一款HTTP请求日志记录中间件。 morgan 1.2.0版本至1.10.1版本存在安全漏洞，该漏洞源于:remote-user token未中和控制字符，可能导致日志伪造。

CVSS 5.3 · Medium EPSS 0.41% · P34

Possible ATT&CK Techniques 1 AI

T1565.003 · Runtime Data Manipulation

Affected Version Matrix 2

VendorProduct Version RangeStatus
morgan morgan 1.2.0≤ 1.10.1 affected
1.11.0 unaffected
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I. Basic Information for CVE-2026-5078

Vulnerability Information
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Vulnerability Title
morgan vulnerable to Log Forging via unneutralized control characters in :remote-user
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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
Vulnerability Title
morgan 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
morgan是expressjs开源的一款HTTP请求日志记录中间件。 morgan 1.2.0版本至1.10.1版本存在安全漏洞，该漏洞源于:remote-user token未中和控制字符，可能导致日志伪造。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
morgan morgan 1.2.0 ~ 1.10.1 -

II. Public POCs for CVE-2026-5078

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III. Intelligence Information for CVE-2026-5078

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Vendor Advisories for CVE-2026-5078 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-5078

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