# CVE-2026-28316: SolarWinds Serv-U IDOR privilege escalation to root

Source: https://junglewise.ai/threats/cve-2026-28316-solarwinds-serv-u-idor-privilege-escalation-to-root  
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-2026-28316 · 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 an authorized domain administrator to gain full control over the underlying system. By exploiting this vulnerability, an attacker can escalate their privileges to the highest level (root), potentially leading to complete data exposure or total service disruption. The risk is particularly high for Linux-based deployments, though Windows systems are also affected to a lesser degree.

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

## Quick answers

**Is CVE-2026-28316 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-28316 being exploited in the wild.

**How severe is CVE-2026-28316?** 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-2026-28316?** 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-2026-28316 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-28316?** 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

An Insecure Direct Object Reference (IDOR) vulnerability (CWE-639) exists in SolarWinds Serv-U versions 15.5.4 HF1 and below. The flaw allows an attacker with existing domain administrator credentials to bypass authorization checks and escalate privileges to a system administrator level. On Linux deployments, this allows for command execution as the root user; the impact is reported as lower on Windows deployments. The attack is reachable over the network but requires high privileges (PR:H) as a precondition. SolarWinds has addressed this in version 2026.3.

## Affected products

- SolarWinds Serv-U 15.5.4 HF1 and below

## Timeline

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

## 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://www.solarwinds.com/trust-center/security-advisories/CVE-2026-28316](https://www.solarwinds.com/trust-center/security-advisories/CVE-2026-28316)

## 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 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)
- [SolarWinds Serv-U IDOR and SMTP Hijacking](https://junglewise.ai/threats/cve-2026-28313-solarwinds-serv-u-idor-and-smtp-hijacking)