CVE-2026-28309: SolarWinds Serv-U is affected by a broken access control vulnerability that allows a domain administrator to c

Q: How do I fix CVE-2026-28309?

serv-u: upgrade to 2026.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-28309 being exploited?

CVE-2026-28309 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-28309 affect?

CVE-2026-28309 affects serv-u. Severity is critical (CVSS 9.1). 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.

Q: How urgent is CVE-2026-28309?

Priority 42/100. Critical severity

This month

CRITICAL 9.1UPGRADE

CVE-2026-28309 is a critical-severity flaw (CVSS 9.1) affecting serv-u. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-07-21
Last modified	2026-10-24

Publisher (CNA): SolarWinds · Vendor: solarwinds

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-21 16:17 UTCPublished CVE record published
2026-10-24 20:10 UTCUpdated Record last modified

solarwinds serv-u UPGRADE

Affected: < 2026.3

Fixed in: 2026.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy serv-u || rpm -q serv-u || serv-u --version

2. UPGRADE to 2026.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade serv-u

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade serv-u

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-28309?

serv-u: upgrade to 2026.3. Exact commands for each OS are on this page.

Is CVE-2026-28309 being exploited?

CVE-2026-28309 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-28309 affect?

CVE-2026-28309 affects serv-u. Severity is critical (CVSS 9.1). 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.

How urgent is CVE-2026-28309?

Priority 42/100. Critical severity

Software pages

Windows vulnerabilities

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References

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