Affects SolarWinds Serv-U — widely used enterprise product; privilege escalation to admin can cause broad disruption and takeover.
CVE-2026-28307
Serv-U privilege escalation lets a domain user group be elevated to administrators.
Is CVE-2026-28307 being exploited?
Not confirmed. CVE-2026-28307 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-2026-28307?
CVE-2026-28307 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-2026-28307?
Yes. A fix has been recorded for CVE-2026-28307. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-28307 affect?
CVE-2026-28307 affects SolarWinds Serv-U, Serv-U FTP/SFTP servers, Windows deployments (lower impact). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-28307?
Apply vendor patch when available; restrict Serv-U admin access and monitor logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated domain user/group can be elevated to administrators, enabling full admin control, account takeover, and lateral movement.
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.