Vulnerability details
CVE-2026-42457
loft-sh loft
vCluster Platform: Stored XSS can lead to privilege escalation
CVSS 3.1
9.0Critical
Official description
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.0Critical | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| loft-sh | loft | < 4.4.3 | CVEProject cvelistV5 (CNA) |
| loft-sh | loft | >= 4.6.0-alpha.1, < 4.6.2 | CVEProject cvelistV5 (CNA) |
| loft-sh | loft | >= 4.7.0-alpha.0, < 4.7.1 | CVEProject cvelistV5 (CNA) |
| loft-sh | loft | >=4.5.0-alpha.0 , < 4.5.5 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://github.com/loft-sh/loft/security/advisories/GHSA-x7cq-v3h6-426c x_refsource_CONFIRM
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Details
- Published
- 2026-05-14
- Last updated
- 2026-05-14
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.31%
Probability of exploitation in 30 days
24.3%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')