CVE-2025-57539

Name: CVE-2025-57539
Creator: NVD / NIST
Published: 2025-09-09T17:16:10.583+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.27%

Last modified Jun 17, 2026

CVE-2025-57539 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. A stored cross-site scripting (XSS) vulnerability in the U2F Origin field of the Datacenter configuration in Proxmox Virtual Environment (PVE) 8.4 allows authenticated users to store malicious input. The payload is rendered unsafely in the Web UI and executed when viewed by other users, potentially leading to session hijacking or other attacks.. EPSS estimates a 0.27% chance of exploitation in the next 30 days.

Description

A stored cross-site scripting (XSS) vulnerability in the U2F Origin field of the Datacenter configuration in Proxmox Virtual Environment (PVE) 8.4 allows authenticated users to store malicious input. The payload is rendered unsafely in the Web UI and executed when viewed by other users, potentially leading to session hijacking or other 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-2025-57539?

How severe is CVE-2025-57539?

CVE-2025-57539 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-2025-57539?

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-2025-57539?

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

Scan your code now

Source: NVD / NIST