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CVE-2026-93483

Quick assessment

Affected
Znuny Znuny
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.

在 Znuny 版本 7.3.6 及更早版本中，攻击者可通过篡改特定的 HTTP 请求头，绕过标准的登录流程，从而非法访问敏感的系统功能。由于应用程序错误地信任该请求头，攻击者可以在无需密码的情况下冒充任何用户（包括管理员），进而获得对机密数据和系统控制功能的完全访问权限。 具体来说，用于代理（Kernel::System::Auth::HTTPBasicAuth）和客户（Kernel::System::CustomerAuth::HTTPBasicAuth）接口的 HTTPBasicAuth 模块在确定登录用户名

CVSS 9.5 · Critical

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-93483

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In Znuny through 7.3.6, an attacker can bypass specific standard login procedures and gain unauthorized access to sensitive system functions by manipulating a specific HTTP request header. Because the application incorrectly trusts this header, an attacker can impersonate any user, including administrators, without requiring a password. This grants full access to confidential data and system controls. More specifically, the HTTPBasicAuth modules for the agent (Kernel::System::Auth::HTTPBasicAuth) and customer (Kernel::System::CustomerAuth::HTTPBasicAuth) interfaces read the username to log in not only from $ENV{REMOTE_USER} (set by the web server after successful authentication), but also, as a fallback, from $ENV{HTTP_REMOTE_USER}, which is populated directly from an attacker-controllable "Remote-User" request header. On systems where HTTPBasicAuth was configured as the authentication backend, this allowed an attacker to log in as any existing user by sending a request with a forged Remote-User header, without providing any credentials.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/AU:Y/R:U/RE:L/U:Red
Source: CVE Program / CVE List V5
Vulnerability Type
使用不可信的源
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Znuny Znuny 0 ~ 6.5.25 -

II. Public POCs for CVE-2026-93483

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III. Intelligence Information for CVE-2026-93483

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Other References for CVE-2026-93483 (2)

IV. Related Vulnerabilities

Same product: Znuny
Same vendor: Znuny
Same weakness: CWE-348

V. Comments for CVE-2026-93483

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