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CVE-2026-21806— HCL BigFix Service Management was affected with Admin Session Concurrency vulnerability (CVE-2026-21806)

Quick assessment

Affected
HCL Software HCL BigFix Service Management
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.

HCL BigFix Service Management 存在管理会话并发漏洞。该应用程序允许同一管理员账户同时存在多个已认证会话，这使得未经授权的攻击者能够预测或劫持有效的会话标识符。若成功利用此漏洞，攻击者可接管受影响的管理员会话，并以完全特权用户的权限执行操作。

CVSS 3.1 · Low EPSS 0.15% · P5

Affected Version Matrix 1

VendorProduct Version RangeStatus
HCL Software HCL BigFix Service Management Version 27 affected
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I. Basic Information for CVE-2026-21806

Vulnerability Information
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Vulnerability Title
HCL BigFix Service Management was affected with Admin Session Concurrency vulnerability (CVE-2026-21806)
Source: CVE Program / CVE List V5
Vulnerability Description
HCL BigFix Service Management is affected by an Administrative Session Concurrency vulnerability. The application allows multiple simultaneous authenticated sessions for the same administrative account, which could enable an unauthorized attacker to predict or hijack valid session identifiers. Successful exploitation allows an attacker to compromise affected administrative sessions and execute actions with full privileged user permissions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
并发问题
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
HCL Software HCL BigFix Service Management Version 27 -

II. Public POCs for CVE-2026-21806

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-21806

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Other References for CVE-2026-21806 (1)

Same Patch Batch · HCL Software · 2026-09-18 · 11 CVEs total

CVE-2026-67100 9.8 CRITICAL HCL BigFix Service Management is affected by multiple security vulnerabilities.
CVE-2026-67101 9.3 CRITICAL HCL BigFix Service Management is affected by multiple security vulnerabilities.
CVE-2026-67102 8.1 HIGH HCL BigFix Service Management is affected by multiple security vulnerabilities.
CVE-2026-67103 7.6 HIGH HCL BigFix Service Management is affected by multiple security vulnerabilities.
CVE-2026-56592 6.5 MEDIUM HCL BigFix Service Management is affected by multiple security vulnerabilities.
CVE-2026-56590 6.4 MEDIUM HCL BigFix Service Management is affected by multiple security vulnerabilities.
CVE-2026-21822 6.3 MEDIUM A path traversal vulnerability has been identified in HCL AppScan 360° (CVE-2026-21822).
CVE-2026-21848 5.0 MEDIUM HCL BigFix Service Management is affected by multiple security vulnerabilities.
CVE-2026-56597 3.1 LOW HCL BigFix Service Management is affected by multiple security vulnerabilities.
CVE-2026-56595 3.1 LOW HCL BigFix Service Management is affected by multiple security vulnerabilities.

IV. Related Vulnerabilities

Same vendor: HCL Software
Same weakness: CWE-557

V. Comments for CVE-2026-21806

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