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CVE-2026-28309

SolarWinds Serv-u broken access control

9.1 CRITICALEPSS 0.50%
  1. Published21 Jul 2026

Description

SolarWinds Serv-U is affected by a broken access control vulnerability that allows a domain administrator to create system administrator accounts. The impact is lower in Windows deployments.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredHigh
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

SolarWinds Serv-u< 2026.3

Remediation

Fixed in
SolarWinds Serv-u≥ 2026.3

References

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Frequently asked

Is CVE-2026-28309 being actively exploited?

CVE-2026-28309 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.50%.

How severe is CVE-2026-28309?

CVE-2026-28309 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.50% probability of exploitation.

Which products are affected by CVE-2026-28309?

Affected products include SolarWinds Serv-u.

How do I fix CVE-2026-28309?

Upgrade affected software to a fixed version, for example SolarWinds Serv-u 2026.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-28309 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.