CVE-2026-28313: SolarWinds Serv-U is affected by an insecure direct object reference (IDOR) vulnerability that can lead to SMT

Q: How do I fix CVE-2026-28313?

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

Q: Is CVE-2026-28313 being exploited?

CVE-2026-28313 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-2026-28313 affect?

CVE-2026-28313 affects serv-u. Severity is critical (CVSS 9.1). SolarWinds Serv-U is affected by an insecure direct object reference (IDOR) vulnerability that can lead to SMTP hijacking leading to arbitrary account takeover. The impact is lower in Windows deployments.

Q: How urgent is CVE-2026-28313?

Priority 42/100. Critical severity

This month

CRITICAL 9.1UPGRADE

CVE-2026-28313 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 an insecure direct object reference (IDOR) vulnerability that can lead to SMTP hijacking leading to arbitrary account takeover. 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-639
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-2026-28313?

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

Is CVE-2026-28313 being exploited?

CVE-2026-28313 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-2026-28313 affect?

CVE-2026-28313 affects serv-u. Severity is critical (CVSS 9.1). SolarWinds Serv-U is affected by an insecure direct object reference (IDOR) vulnerability that can lead to SMTP hijacking leading to arbitrary account takeover. The impact is lower in Windows deployments.

How urgent is CVE-2026-28313?

Priority 42/100. Critical severity

Software pages

Windows vulnerabilities

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References

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