Is CVE-2026-28304 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-28304 being exploited in the wild.

How severe is CVE-2026-28304?

Critical severity, with a CVSS score of 9.1, published 21 July 2026.

Which products and versions are affected?

SolarWinds Serv-U 15.5.4 HF1 and below.

Is there a fix for CVE-2026-28304?

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-2026-28304 attacked?

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

Am I affected by CVE-2026-28304?

Check whether you run SolarWinds Serv-U 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-2026-28304: SolarWinds Serv-U remote code execution via improper access control

CVE-2026-28304 · Severity: critical · CVSS 9.1 · Published 2026-07-21

SolarWinds Serv-U, a managed file transfer and FTP server, is affected by a critical security vulnerability. An attacker could exploit this flaw to remotely execute arbitrary commands on the server with high privileges (root). This could lead to a complete takeover of the file transfer system, unauthorized access to sensitive customer data, and potential disruption of business operations.

Technologies: SolarWinds Serv-U. Vendors: SolarWinds.

Quick answers

Is CVE-2026-28304 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-28304 being exploited in the wild.
How severe is CVE-2026-28304?: Critical severity, with a CVSS score of 9.1, published 21 July 2026.
Which products and versions are affected?: SolarWinds Serv-U 15.5.4 HF1 and below.
Is there a fix for CVE-2026-28304?: 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-2026-28304 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-28304?: Check whether you run SolarWinds Serv-U 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

SolarWinds Serv-U is vulnerable to remote code execution (RCE) due to improper access control (CWE-284). The vulnerability allows an authenticated attacker with high privileges to execute arbitrary code on the host system. On non-Windows deployments, this execution occurs with root privileges, while the impact is reportedly lower on Windows systems. The attack vector is network-based and does not require user interaction, though it does require high-level administrative credentials. SolarWinds has addressed this issue in Serv-U version 2026.3.

Affected products

SolarWinds Serv-U 15.5.4 HF1 and below

Timeline

2026-07-21: disclosed
2026-07-21: advisory

References

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