How severe is CVE-2025-57540?

CVE-2025-57540 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-57540 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-57540?

CVE-2025-57540 affects Proxmox Virtual Environment. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-57540?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-57540 have an EU (EUVD) identifier?

Yes. CVE-2025-57540 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27389.

When was CVE-2025-57540 published?

CVE-2025-57540 was published on 2025-09-09 and last updated on 2026-06-17.

CVE-2025-57540

CVE-2025-57540 is a medium-severity vulnerability in Proxmox Virtual Environment with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-27389
Weakness: CWE-79
Affected product: Proxmox Virtual Environment
Published: 2025-09-09
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-57540?: CVE-2025-57540 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-57540 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-57540?: CVE-2025-57540 affects Proxmox Virtual Environment. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-57540?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-57540 have an EU (EUVD) identifier?: Yes. CVE-2025-57540 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27389.
When was CVE-2025-57540 published?: CVE-2025-57540 was published on 2025-09-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:proxmox:virtual_environment:8.4:*:*:*:*:*:*:*

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