CVE-2026-21806
criticalpriority · track · 39EPSS 0.002 · 10 %ileDEUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–critical · 3.1–9.8
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (3)
Products and version ranges known to be affected.
- hcltech bigfix service management= 27nvdUScpe:2.3:a:hcltech:bigfix_service_management:*:*:*:*:*:*:*:*
advisories (1)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-3461HCL BigFix Service Management: Mehrere SchwachstellenDeutsch2026-09-17csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in HCL BigFix ausnutzen, um Sicherheitsmaßnahmen zu umgehen, erweiterte Berechtigungen zu erlangen, beliebigen Code auszuführen, Daten offenzulegen oder zu manipulieren, SQL-Injection- oder Cross-Site-Scripting-Angriffe durchzuführen oder serverseitige Request-Forgery- sowie Brute-Force- und Session-Hijacking-Angriffe auszuführen.
sources
Which sources assert this record, and when.
references (1) nvd
External citations — patches, advisories, analysis.
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