TI-2025-35562 Aliases CVE-2025-57540 GHSA-2p4j-7hmq-hf5r

A stored cross-site scripting (XSS) vulnerability exists in the WebAuthn Relying Party…

MEDIUM 58CWE-79Published 2025-09-09 · Updated 2025-09-10

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00292 21st percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:proxmox:virtual_environment:8.4:::::::*	8.4	Vulnerable	Proxmox

cpe:2.3:a:proxmox:virtual_environment:8.4:*:*:*:*:*:*:* Versions 8.4 Vulnerable ·Proxmox

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2025-57540
2026-10-03 Alias added: GHSA-2p4j-7hmq-hf5r

References

TI-2022-16050 Proxmox Virtual Environment (PVE) and Proxmox Mail Gateway (PMG) are vulnerable to SSRF… CVSS 3.1CRITICAL 9.8
TI-2022-13353 A reflected cross-site scripting (XSS) vulnerability in Proxmox Virtual Environment prior… CVSS 3.1CRITICAL 9.0
TI-2022-16049 A response-header CRLF injection vulnerability in the Proxmox Virtual Environment (PVE)… CVSS 3.1HIGH 7.1
TI-2025-35561 A stored cross-site scripting (XSS) vulnerability in the U2F Origin field of the… CVSS 3.1MEDIUM 5.4
TI-2025-35560 A stored cross-site scripting (XSS) vulnerability in the HTTP Proxy field within the… CVSS 3.1MEDIUM 5.4
TI-2023-23190 An issue in Proxmox Server Solutions GmbH Proxmox VE v.5.4 thru v.8.0, Proxmox Backup… CVSS 3.1HIGH 8.8

See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences