Affects SolarWinds Serv-U, a widely used enterprise product; allows escalation to system admin enabling full system compromise and newsworthy impact.
CVE-2026-28306
Privilege escalation in SolarWinds Serv-U allows domain admin -> system admin.
Is CVE-2026-28306 being exploited?
Not confirmed. CVE-2026-28306 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-2026-28306?
CVE-2026-28306 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-2026-28306?
Yes. A fix has been recorded for CVE-2026-28306. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-28306 affect?
CVE-2026-28306 affects SolarWinds Serv-U (FTP/SFTP server). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-28306?
Apply vendor patch when released; restrict domain admin access and isolate Serv-U hosts.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Domain administrator can elevate to system administrator on Serv-U hosts, enabling full system control, persistence, and access to sensitive data.
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.