# CVE-2026-28312: SolarWinds Serv-U privilege escalation in administrator group access

Source: https://junglewise.ai/threats/cve-2026-28312-solarwinds-serv-u-privilege-escalation-in-administrator-group  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-21. Updated: 2026-07-21  
License: CC BY 4.0 with a link back

CVE-2026-28312 · Severity: critical · CVSS 9.1 · Published 2026-07-21

SolarWinds Serv-U, a managed file transfer and FTP server, is affected by a security flaw that allows users with existing group access to elevate their privileges to system administrator. On Linux-based systems, this allows an attacker to take full control of the server and execute commands with root-level authority, potentially leading to data theft or complete service disruption. While the impact is slightly lower on Windows deployments, the vulnerability still poses a significant risk to organizational data and infrastructure.

Technologies: [SolarWinds Serv-U](https://junglewise.ai/threats/technologies/serv-u). Vendors: [SolarWinds](https://junglewise.ai/threats/vendors/solarwinds).

## Quick answers

**Is CVE-2026-28312 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-28312 being exploited in the wild.

**How severe is CVE-2026-28312?** 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-2026-28312?** A patch was published on 2026-07-21: Fixed in Serv-U version 2026.3 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-28312 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-28312?** 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

A privilege escalation vulnerability exists in SolarWinds Serv-U due to improper authorization (CWE-285). An attacker with high-privileged credentials (such as group-level access) can exploit this flaw to elevate their permissions to system administrator. On Linux deployments, this leads to arbitrary code execution with root privileges; the impact is reported as lower on Windows systems but still critical. The vulnerability is reachable over the network without user interaction. 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: advisory: Initial advisory published by SolarWinds and NVD
- 2026-07-21: patched: Fixed in Serv-U version 2026.3

## References

- [https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_2026-3_release_notes.htm](https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_2026-3_release_notes.htm)
- [https://https//www.solarwinds.com/trust-center/security-advisories/CVE-2026-28312](https://https//www.solarwinds.com/trust-center/security-advisories/CVE-2026-28312)

## Related threats

- [SolarWinds Serv-U broken access control privilege escalation](https://junglewise.ai/threats/cve-2026-28321-solarwinds-serv-u-broken-access-control-privilege-escalation)
- [SolarWinds Serv-U privilege escalation via IDOR](https://junglewise.ai/threats/cve-2026-28317-solarwinds-serv-u-privilege-escalation-via-idor)
- [SolarWinds Serv-U IDOR privilege escalation to root](https://junglewise.ai/threats/cve-2026-28316-solarwinds-serv-u-idor-privilege-escalation-to-root)
- [SolarWinds Serv-U stored XSS in administrator interface](https://junglewise.ai/threats/cve-2026-28315-solarwinds-serv-u-stored-xss-in-administrator-interface)
- [SolarWinds Serv-U account takeover via IDOR](https://junglewise.ai/threats/cve-2026-28314-solarwinds-serv-u-account-takeover-via-idor)