PT-2025-36794 · Proxmox · Proxmox Virtual Environment

Khankishiyev-J · Published 2025-09-09 · Updated 2025-09-17 · CVE-2025-57540

Positive Technologies (AI Summary)

CVSS v3.1

5.4

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: Proxmox Virtual Environment version 8.4

Description: A stored cross-site scripting (XSS) issue exists in the WebAuthn Relying Party field within the Datacenter configuration. Authenticated users can inject JavaScript code that is later executed in the browsers of users who view the configuration page, enabling client-side attacks.

Recommendations: Update to a newer version that contains a fix for this issue.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2025-57540

Affected Products

Proxmox Virtual Environment

References · 8

• 🔥 https://github.com/khankishiyev-j/bug-bounty/blob/main/proxmox-xss · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2025-57540 · Security Note
• https://forum.proxmox.com/threads/proxmox-virtual-environment-security-advisories.149331/page-2#post-792010 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-57540 · Vendor Advisory
• https://youtube.com/watch?v=-wvkN-7oT5U · Note
• https://twitter.com/CVEnew/status/1965691911337103567 · Twitter Post
• https://t.me/cveNotify/135710 · Telegram Post
• https://twitter.com/VulmonFeeds/status/1965566419539501441 · Twitter Post