XSS in Proxmox Virtual Environment
CVE-2025-57540
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (19.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Proxmox Virtual Environment — versions 8.4
Weakness classification (CWE)
References
- github.com/khankishiyev-j/bug-bounty/blob/main/proxmox-xss (Exploit, Third Party Advisory)
- www.youtube.com/watch (Broken Link)
- forum.proxmox.com/threads/proxmox-virtual-environment-security-advisories.14933… (Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-57540?
- CVE-2025-57540 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-2025-57540?
- Medium severity. CVSS v3 base score is 5.4 out of 10.