CVE-2026-28304

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-21. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

SolarWinds Serv-U is affected by a remote code execution vulnerability that, when exploited, can allow the arbitrary execution of code remotely as root. The impact is lower in Windows deployments.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

July 21, 2026

Last Modified

July 24, 2026

Advisory Details (2)

Auto-updated Jul 21, 2026
No patch confirmed yet.
generic

SolarWinds Trust Center Security Advisories | CVE-2026-28304

https://www.solarwinds.com/trust-center/security-advisories/CVE-2026-28304
generic

Serv-U 2026.3 release notes

https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_2026-3_release_notes.htm

Vendor Advisories for CVE-2026-28304(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 45× in last 7d / 57× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-31 01:18 UTCGHSA enrichment
  2. 2026-07-30 21:19 UTCGHSA enrichment
  3. 2026-07-30 17:07 UTCEG score recompute
  4. 2026-07-30 17:07 UTCGHSA enrichment
  5. 2026-07-30 16:27 UTCEPSS rescore
  6. 2026-07-30 13:04 UTCEG score recompute
  7. 2026-07-30 13:04 UTCGHSA enrichment
  8. 2026-07-30 09:05 UTCGHSA enrichment
  9. 2026-07-30 05:06 UTCEG score recompute
  10. 2026-07-30 05:06 UTCGHSA enrichment
  11. 2026-07-30 01:30 UTCEPSS rescore
  12. 2026-07-30 01:07 UTCGHSA enrichment
  13. 2026-07-29 20:55 UTCGHSA enrichment
  14. 2026-07-29 16:55 UTCGHSA enrichment
  15. 2026-07-29 12:57 UTCGHSA enrichment
  16. 2026-07-29 08:59 UTCGHSA enrichment
  17. 2026-07-29 05:00 UTCGHSA enrichment
  18. 2026-07-29 01:00 UTCGHSA enrichment
  19. 2026-07-28 21:01 UTCGHSA enrichment
  20. 2026-07-28 17:03 UTCEG score recompute
  21. 2026-07-28 17:03 UTCGHSA enrichment
  22. 2026-07-28 15:36 UTCEPSS rescore
  23. 2026-07-28 11:30 UTCGHSA enrichment
  24. 2026-07-28 07:30 UTCGHSA enrichment
  25. 2026-07-28 03:29 UTCGHSA enrichment
Show 32 more
  1. 2026-07-27 23:29 UTCGHSA enrichment
  2. 2026-07-27 19:15 UTCGHSA enrichment
  3. 2026-07-27 15:13 UTCEG score recompute
  4. 2026-07-27 15:13 UTCGHSA enrichment
  5. 2026-07-27 10:30 UTCGHSA enrichment
  6. 2026-07-27 06:31 UTCGHSA enrichment
  7. 2026-07-27 02:31 UTCGHSA enrichment
  8. 2026-07-26 22:27 UTCGHSA enrichment
  9. 2026-07-26 18:28 UTCEG score recompute
  10. 2026-07-26 18:28 UTCGHSA enrichment
  11. 2026-07-26 14:54 UTCEPSS rescore
  12. 2026-07-26 14:54 UTCEPSS rescore
  13. 2026-07-26 14:29 UTCGHSA enrichment
  14. 2026-07-26 10:31 UTCEG score recompute
  15. 2026-07-26 10:31 UTCGHSA enrichment
  16. 2026-07-26 04:21 UTCEG score recompute
  17. 2026-07-26 04:21 UTCGHSA enrichment
  18. 2026-07-25 14:18 UTCEPSS rescore
  19. 2026-07-25 14:17 UTCEPSS rescore
  20. 2026-07-24 14:17 UTCEPSS rescore
  21. 2026-07-23 14:18 UTCEPSS rescore
  22. 2026-07-23 14:18 UTCEPSS rescore
  23. 2026-07-23 03:08 UTCEG score recompute
  24. 2026-07-22 23:08 UTCEG score recompute
  25. 2026-07-22 23:08 UTCGHSA enrichment
  26. 2026-07-22 14:08 UTCEPSS rescore
  27. 2026-07-22 14:08 UTCEPSS rescore
  28. 2026-07-21 18:51 UTCEG score recompute
  29. 2026-07-21 18:50 UTCGHSA enrichment
  30. 2026-07-21 17:22 UTCEG score recompute
  31. 2026-07-21 16:01 UTCEG score recompute
  32. 2026-07-21 15:58 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-28304?
CVE-2026-28304 is a critical vulnerability published on July 21, 2026. SolarWinds Serv-U is affected by a remote code execution vulnerability that, when exploited, can allow the arbitrary execution of code remotely as root. The impact is lower in Windows deployments.
When was CVE-2026-28304 disclosed?
CVE-2026-28304 was first published in the National Vulnerability Database on July 21, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-28304 actively exploited?
CVE-2026-28304 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.3% of all scored CVEs.
What is the CVSS score of CVE-2026-28304?
CVE-2026-28304 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-28304?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28304, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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