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TI-2026-30746 Aliases CVE-2026-42457

vCluster Platform: Stored XSS can lead to privilege escalation

Priority MEDIUM 41CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

vCluster Platform provides a Kubernetes platform for managing virtual clusters, multi-tenancy, and cluster sharing. Prior to 4.4.3, 4.5.5, 4.6.2, 4.7.1, and 4.8.0, there is a Stored XSS attack vulnerability via the name field of a templateRef. This can lead to the execution of arbitrary external scripts within the platform's browser context. In the worst case, a malicious user could potentially create a new Global-Admin user, bypassing other security restrictions. The attacker needs the ability to create namespaces. This vulnerability is fixed in 4.4.3, 4.5.5, 4.6.2, 4.7.1, and 4.8.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00312 24th percentileScored 2026-11-07
Fix Fixed loft (loft-sh): 4.4.3, 4.5.5, 4.6.2 +1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
loft-shloftbefore 4.4.3; 4.5.0-alpha.0 to before 4.5.5; 4.6.0-alpha.1 to before 4.6.2; 4.7.0-alpha.0 to before 4.7.14.4.3, 4.5.5, 4.6.2, 4.7.1Patch availableCNA
  • loft Vendorloft-sh Affected before 4.4.3; 4.5.0-alpha.0 to before 4.5.5; 4.6.0-alpha.1 to before 4.6.2; 4.7.0-alpha.0 to before 4.7.1 Fixed in 4.4.3, 4.5.5, 4.6.2, 4.7.1 Patch available CNA

Remediation

  • Fix · CNA loft (loft-sh) Fixed in 4.4.3, 4.5.5, 4.6.2, 4.7.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42457

References

Other 1

  • TI-2026-18323 vCluster Platform's Access Keys Allows Access Beyond Scope CVSS 3.1CRITICAL 9.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences