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Vulnerability · Published Sep 18, 2026 · Assigned by HCL

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

Low 3.1

In plain English

A low-severity security flaw in HCL BigFix Service Management from HCL Software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).

Severity (CVSS 3.1)3.1Low
Exploit odds (30 days)0.2%top 90.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

VendorProductVersions
HCL Software HCL BigFix Service Management Version 27

Weakness: CWE-557 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

References