# CVE-2026-28314: SolarWinds Serv-U account takeover via IDOR

Source: https://junglewise.ai/threats/cve-2026-28314-solarwinds-serv-u-account-takeover-via-idor  
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-2026-28314 · 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 authenticated user to take over other user accounts. By exploiting this vulnerability, an attacker could gain unauthorized access to sensitive files and administrative controls. The business impact is highest on Linux deployments, while Windows-based installations are less severely affected.

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

## Quick answers

**Is CVE-2026-28314 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-28314 being exploited in the wild.

**How severe is CVE-2026-28314?** 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-2026-28314?** 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-2026-28314 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-28314?** 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 (version 15.5.4 HF1 and below) contains an Insecure Direct Object Reference (IDOR) vulnerability, classified as CWE-639. The flaw allows an authenticated attacker with high privileges to bypass authorization checks by manipulating user-controlled keys, ultimately leading to a complete account takeover. The attack vector is network-based and does not require user interaction, though it does require prior authentication. While the vulnerability is present on both Windows and Linux platforms, the vendor notes the impact is lower in Windows deployments. A fix is available 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

- [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-2026-28314](https://www.solarwinds.com/trust-center/security-advisories/CVE-2026-28314)

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