CVE-2025-57540 — MEDIUM (5.4)

Vulnerability Description

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.

CVSS Score

5.4

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Proxmox	Virtual Environment	8.4

Related Weaknesses (CWE)

CWE-79

References

https://forum.proxmox.com/threads/proxmox-virtual-environment-security-advisorieIssue TrackingVendor Advisory
https://github.com/khankishiyev-j/bug-bounty/blob/main/proxmox-xssExploitThird Party Advisory
https://www.youtube.com/watch?v=-wvkN-7oT5UBroken Link
https://github.com/khankishiyev-j/bug-bounty/blob/main/proxmox-xssExploitThird Party Advisory

FAQ

What is CVE-2025-57540?

CVE-2025-57540 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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 injec...

How severe is CVE-2025-57540?

CVE-2025-57540 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-57540?

Check the references section above for vendor advisories and patch information. Affected products include: Proxmox Virtual Environment.