CVE-2025-57540

Name: CVE-2025-57540
Creator: NVD / NIST
Published: 2025-09-09T17:16:10.78+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.27%

Last modified Jun 17, 2026

CVE-2025-57540 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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.. EPSS estimates a 0.27% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.27%

18.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Proxmox	Virtual Environment	8.4

References

https://forum.proxmox.com/threads/proxmox-virtual-environment-security-advisories.149331/page-2#post-792010Issue Tracking, Vendor Advisory
https://github.com/khankishiyev-j/bug-bounty/blob/main/proxmox-xssExploit, Third Party Advisory
https://www.youtube.com/watch?v=-wvkN-7oT5UBroken Link
https://github.com/khankishiyev-j/bug-bounty/blob/main/proxmox-xssExploit, Third Party Advisory

Timeline

Published: Sep 9, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-57540?

How severe is CVE-2025-57540?

CVE-2025-57540 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.

How do I fix CVE-2025-57540?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-57540?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST