CVE-2025-57539

mediumpriority · track · 0EPSS 0.003 · 21 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.29% (21st) EPSS

CVSS 5.4 · medium

Is it mine?

10 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-23

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.

cvss

Technical severity, 0–10. One row per scoring source.

5.4

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:Nsecondary · ENISA EU

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:Nsecondaryexploitability 2.3 · impact 2.7

v3.15mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79US

affected products (10)

Products and version ranges known to be affected.

Proxmox Backup Server <3.4.6-1all versionscert_bundDE
Proxmox Backup Server <4.0.14-1all versionscert_bundDE
Proxmox Virtual Environment pve-manager <8.4.11all versionscert_bundDE
Proxmox Virtual Environment pve-manager <9.0.5all versionscert_bundDE
Proxmox Backup Server< 3.4.6-1cert_bundDE
Proxmox Backup Server< 4.0.14-1cert_bundDE
Proxmox Virtual Environment≤ pve-manager <8.4.11cert_bundDE
Proxmox Virtual Environment≤ pve-manager <9.0.5cert_bundDE
n/a n/a≤ n/aenisa_euvdEU
proxmox virtual environment= 8.4nvdUScpe:2.3:a:proxmox:virtual_environment:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-1835Proxmox Virtual Environment und Backup Server: Mehrere Schwachstellen ermöglichen Cross-Site ScriptingDeutsch2025-08-13csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Proxmox Virtual Environment und Proxmox Backup Server ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd NVD CVE.org MITRE

published 2025-09-09modified 2026-06-17

references (10)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan