SolarWinds Serv-U is widely used enterprise file-transfer software; this flaw lets domain admins create system admin accounts, risking organization-wide compromise and persistent takeover.
CVE-2026-28309
Broken access control in SolarWinds Serv-U allows domain admins to create system admin accounts.
Is CVE-2026-28309 being exploited?
Not confirmed. CVE-2026-28309 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.50% probability of exploitation in the next 30 days.
How severe is CVE-2026-28309?
CVE-2026-28309 is rated Critical with a CVSS score of 9.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-28309?
Yes. A fix has been recorded for CVE-2026-28309. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-28309 affect?
CVE-2026-28309 affects SolarWinds Serv-U, Serv-U Server, Serv-U Administrator Console, Linux deployments, and 1 further product or version. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-28309?
Restrict domain admin access, audit/remove accounts, enable logging, apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Domain admins can create system admin accounts, enabling persistent full admin access and potential service takeover.
Immediate action required
- affected15.5.4 HF1 and below
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.