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CVE

CVE-2026-42457

vCluster Platform: Stored XSS can lead to privilege escalation
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CVE

CVE-2026-42457

vCluster Platform: Stored XSS can lead to privilege escalation

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42457.json, https://github.com/loft-sh/loft/security/advisories/GHSA-x7cq-v3h6-426c, https://nvd.nist.gov/vuln/detail/CVE-2026-42457

Severity

9

CVSS Score
0
10

Basic Information

Base CVSS
9
EPSS Probability
0.00312%
EPSS Percentile
0.24142%
Introduced Version
0
Fix Available
76e6e9a0a1cc13b7d945c9809860ac3736403164

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