Vulnerability in Hcl Software Bigfix Service Management
CVE-2026-21806
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.002 (9.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 9.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Hcl Software Bigfix Service Management — versions Version 27
- Hcltech Bigfix Service Management — versions 27
Weakness classification (CWE)
References
- support.hcl-software.com/csm (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-21806?
- CVE-2026-21806 is a low-severity vulnerability in Hcl Software Bigfix Service Management, classified under CWE-557. CVSS score: 3.1/10. Published 2026-09-18.
- How severe is CVE-2026-21806?
- Low severity. CVSS v3 base score is 3.1 out of 10.