CVE-2025-57540

low-risk
Published 2025-09-09

A stored cross-site scripting (XSS) vulnerability exists in the WebAuthn Relying Party field within the Datacenter configuration of Proxmox Virtual Environment (PVE) 8.4. Authenticated users can inject JavaScript code that is later executed in the browsers of users who view the configuration page, enabling client-side attacks.

Do I need to act?

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0.03% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.4/10 Medium
NETWORK / LOW complexity

Affected Products (1)

Virtual Environment

Affected Vendors

Proxmox

References (4)

Issue Tracking https://forum.proxmox.com/threads/proxmox-virtual-environment-security-advisorie...
Exploit https://github.com/khankishiyev-j/bug-bounty/blob/main/proxmox-xss
Broken Link https://www.youtube.com/watch?v=-wvkN-7oT5U
Exploit https://github.com/khankishiyev-j/bug-bounty/blob/main/proxmox-xss
26
/ 100
low-risk
Severity 21/34 · High
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal