CVE-2026-28309

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM 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: 0%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 broken access control vulnerability that allows a domain administrator to create system administrator accounts. The impact is lower in Windows deployments.

CVSS v3
9.1
EG Score
9.1(medium)
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
0%
EPSS %ILE
41%
KEV
Not listed

Published

July 21, 2026

Last Modified

July 24, 2026

Advisory Details (1)

Auto-updated Sep 7, 2026
No patch confirmed yet.
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-2026-28309(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 25× in last 7d / 169× 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.

Showing the most recent 100 of 333 total refreshes for this CVE.

  1. 2026-09-11 18:17 UTCEG score recompute
  2. 2026-09-11 18:17 UTCGHSA enrichment
  3. 2026-09-11 14:52 UTCEPSS rescore
  4. 2026-09-11 09:04 UTCEG score recompute
  5. 2026-09-11 09:04 UTCGHSA enrichment
  6. 2026-09-10 09:34 UTCEPSS rescore
  7. 2026-09-09 11:32 UTCEG score recompute
  8. 2026-09-09 11:32 UTCGHSA enrichment
  9. 2026-09-08 22:00 UTCEPSS rescore
  10. 2026-09-08 02:17 UTCGHSA enrichment
  11. 2026-09-07 22:38 UTCEG score recompute
  12. 2026-09-07 22:38 UTCGHSA enrichment
  13. 2026-09-07 16:01 UTCEPSS rescore
  14. 2026-09-06 18:47 UTCGHSA enrichment
  15. 2026-09-06 14:37 UTCEG score recompute
  16. 2026-09-06 14:37 UTCGHSA enrichment
  17. 2026-09-06 13:47 UTCEPSS rescore
  18. 2026-09-06 13:47 UTCEPSS rescore
  19. 2026-09-06 10:58 UTCGHSA enrichment
  20. 2026-09-06 04:02 UTCGHSA enrichment
  21. 2026-09-05 23:30 UTCGHSA enrichment
  22. 2026-09-05 19:51 UTCEG score recompute
  23. 2026-09-05 19:51 UTCGHSA enrichment
  24. 2026-09-05 08:56 UTCEG score recompute
  25. 2026-09-05 08:56 UTCGHSA enrichment
Show 75 more
  1. 2026-09-04 05:06 UTCEPSS rescore
  2. 2026-09-02 14:11 UTCEPSS rescore
  3. 2026-09-02 00:57 UTCEG score recompute
  4. 2026-09-02 00:57 UTCGHSA enrichment
  5. 2026-09-01 13:53 UTCEPSS rescore
  6. 2026-09-01 04:39 UTCEPSS rescore
  7. 2026-09-01 04:39 UTCEPSS rescore
  8. 2026-08-31 05:59 UTCGHSA enrichment
  9. 2026-08-31 02:20 UTCGHSA enrichment
  10. 2026-08-30 22:40 UTCEG score recompute
  11. 2026-08-30 22:40 UTCGHSA enrichment
  12. 2026-08-30 19:17 UTCEPSS rescore
  13. 2026-08-30 19:01 UTCGHSA enrichment
  14. 2026-08-30 15:21 UTCGHSA enrichment
  15. 2026-08-30 10:55 UTCGHSA enrichment
  16. 2026-08-30 05:57 UTCGHSA enrichment
  17. 2026-08-30 02:18 UTCEG score recompute
  18. 2026-08-30 02:18 UTCGHSA enrichment
  19. 2026-08-30 01:22 UTCEPSS rescore
  20. 2026-08-28 21:41 UTCEPSS rescore
  21. 2026-08-28 01:39 UTCGHSA enrichment
  22. 2026-08-27 21:17 UTCGHSA enrichment
  23. 2026-08-27 15:12 UTCEG score recompute
  24. 2026-08-27 15:12 UTCGHSA enrichment
  25. 2026-08-27 14:25 UTCEPSS rescore
  26. 2026-08-27 11:21 UTCGHSA enrichment
  27. 2026-08-27 04:59 UTCGHSA enrichment
  28. 2026-08-27 01:08 UTCGHSA enrichment
  29. 2026-08-26 21:29 UTCGHSA enrichment
  30. 2026-08-26 14:56 UTCEG score recompute
  31. 2026-08-26 14:56 UTCGHSA enrichment
  32. 2026-08-26 14:46 UTCEPSS rescore
  33. 2026-08-26 10:59 UTCGHSA enrichment
  34. 2026-08-26 05:56 UTCGHSA enrichment
  35. 2026-08-26 02:16 UTCGHSA enrichment
  36. 2026-08-25 22:37 UTCGHSA enrichment
  37. 2026-08-25 18:20 UTCEG score recompute
  38. 2026-08-25 18:20 UTCGHSA enrichment
  39. 2026-08-25 13:49 UTCEPSS rescore
  40. 2026-08-25 13:09 UTCGHSA enrichment
  41. 2026-08-25 09:25 UTCGHSA enrichment
  42. 2026-08-25 05:47 UTCGHSA enrichment
  43. 2026-08-25 02:07 UTCGHSA enrichment
  44. 2026-08-24 22:28 UTCGHSA enrichment
  45. 2026-08-24 18:50 UTCGHSA enrichment
  46. 2026-08-24 15:01 UTCEG score recompute
  47. 2026-08-24 15:01 UTCGHSA enrichment
  48. 2026-08-24 14:17 UTCEPSS rescore
  49. 2026-08-24 11:21 UTCEG score recompute
  50. 2026-08-24 11:21 UTCGHSA enrichment
  51. 2026-08-24 07:41 UTCGHSA enrichment
  52. 2026-08-24 03:41 UTCGHSA enrichment
  53. 2026-08-23 23:35 UTCGHSA enrichment
  54. 2026-08-23 19:56 UTCGHSA enrichment
  55. 2026-08-23 16:17 UTCGHSA enrichment
  56. 2026-08-23 12:27 UTCGHSA enrichment
  57. 2026-08-23 08:48 UTCGHSA enrichment
  58. 2026-08-23 05:09 UTCGHSA enrichment
  59. 2026-08-23 01:29 UTCEG score recompute
  60. 2026-08-23 01:29 UTCGHSA enrichment
  61. 2026-08-23 00:19 UTCEPSS rescore
  62. 2026-08-22 21:51 UTCGHSA enrichment
  63. 2026-08-22 18:12 UTCGHSA enrichment
  64. 2026-08-22 14:33 UTCGHSA enrichment
  65. 2026-08-22 10:50 UTCGHSA enrichment
  66. 2026-08-22 07:11 UTCGHSA enrichment
  67. 2026-08-22 03:32 UTCGHSA enrichment
  68. 2026-08-21 23:53 UTCEG score recompute
  69. 2026-08-21 23:53 UTCGHSA enrichment
  70. 2026-08-21 23:49 UTCEPSS rescore
  71. 2026-08-21 20:14 UTCGHSA enrichment
  72. 2026-08-21 16:35 UTCGHSA enrichment
  73. 2026-08-21 12:38 UTCGHSA enrichment
  74. 2026-08-21 08:58 UTCGHSA enrichment
  75. 2026-08-21 05:12 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-28309?
CVE-2026-28309 is a critical vulnerability published on July 21, 2026. 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.
When was CVE-2026-28309 disclosed?
CVE-2026-28309 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-2026-28309 actively exploited?
CVE-2026-28309 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 59.1% of all scored CVEs.
What is the CVSS score of CVE-2026-28309?
CVE-2026-28309 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-28309?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28309, 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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