What is CVE-2025-57539?

CVE-2025-57539 is a medium-severity vulnerability in Proxmox Virtual Environment, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2025-09-09.

How severe is CVE-2025-57539?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Proxmox Virtual Environment

CVE-2025-57539

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (18.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Proxmox Virtual_environment — versions 8.4
N/a — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

cve@mitre.org (Exploit, Third Party Advisory)
cve@mitre.org (Broken Link)
cve@mitre.org (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2025-57539?: CVE-2025-57539 is a medium-severity vulnerability in Proxmox Virtual Environment, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2025-09-09.
How severe is CVE-2025-57539?: Medium severity. CVSS v3 base score is 5.4 out of 10.