Is CVE-2026-51081 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-51081 being exploited in the wild.

How severe is CVE-2026-51081?

Informational severity, with a CVSS score of 0, published 17 July 2026.

Which products and versions are affected?

Proxmox Virtual Environment pve-manager < 9.0.5.

Is there a fix for CVE-2026-51081?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-51081 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-51081?

Check whether you run Proxmox Virtual Environment at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-51081: Proxmox Virtual Environment stored XSS in config values

Q: Is there a fix for CVE-2026-51081?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

Q: How is CVE-2026-51081 attacked?

It is attacked over the network, in a network appliance.

Q: Am I affected by CVE-2026-51081?

Check whether you run Proxmox Virtual Environment at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-51081 · Severity: info · CVSS 0 · Published 2026-07-17

Proxmox Virtual Environment, a platform for managing virtual machines and containers, is affected by a security flaw in its web management interface. An attacker with administrative privileges could inject malicious scripts into configuration settings for HTTP proxies or authentication methods. If another administrator views these settings, the script could execute in their browser, potentially leading to unauthorized actions or session hijacking.

Vendors: Proxmox.

Quick answers

Is CVE-2026-51081 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-51081 being exploited in the wild.
How severe is CVE-2026-51081?: Informational severity, with a CVSS score of 0, published 17 July 2026.
Which products and versions are affected?: Proxmox Virtual Environment pve-manager < 9.0.5.
Is there a fix for CVE-2026-51081?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-51081 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-51081?: Check whether you run Proxmox Virtual Environment at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A stored cross-site scripting (XSS) vulnerability exists in the pve-manager component of Proxmox Virtual Environment. The vulnerability is located in the dialogues for HTTP proxy, WebAuthN, and U2F settings. An attacker requires 'Sys.Modify' privileges on the root ACL path ('/') to exploit this, which is typically restricted to the Administrator role. By injecting a malicious payload into these configuration fields, the script is stored and later executed in the context of any user who views those settings. The issue is resolved in pve-manager versions 9.0.5 and 8.4.11.

Affected products

Proxmox Proxmox Virtual Environment (PVE) 9.x pve-manager < 9.0.5
Proxmox Proxmox Virtual Environment (PVE) 8.x pve-manager < 8.4.11

Timeline

2025-08-14: advisory: Proxmox internal advisory PSA-2025-00013-1 released
2026-07-17: disclosed: CVE-2026-51081 published

References

https://forum.proxmox.com/threads/proxmox-virtual-environment-security-advisories.149331/post-849973

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