CVE-2025-57539: virtual XSS — Exploit & Fix

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.

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CVSS v3.1 Score

5.4

MEDIUM

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

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
proxmox	virtual_environment	All

References

Advisories & Patches

https://forum.proxmox.com/threads/proxmox-virtual-environment-security-advisories.149331/page-2#post-792010

Exploits

https://github.com/khankishiyev-j/bug-bounty/blob/main/proxmox-xss https://github.com/khankishiyev-j/bug-bounty/blob/main/proxmox-xss

Other References

https://www.youtube.com/watch?v=-wvkN-7oT5U

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2025-57539? +

CVE-2025-57539 has a CVSS v3.1 score of 5.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-57539? +

CVE-2025-57539 affects products from proxmox, specifically: virtual_environment. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-57539? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-57539