CVE-2026-28313

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: 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 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.

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%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

July 21, 2026

Last Modified

July 24, 2026

Advisory Details (1)

Auto-updated Jul 21, 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-2026-28313(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 35× in last 7d / 40× 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. 2026-07-28 22:37 UTCGHSA enrichment
  2. 2026-07-28 18:22 UTCEG score recompute
  3. 2026-07-28 18:22 UTCGHSA enrichment
  4. 2026-07-28 15:36 UTCEPSS rescore
  5. 2026-07-28 14:05 UTCGHSA enrichment
  6. 2026-07-28 09:47 UTCGHSA enrichment
  7. 2026-07-28 05:32 UTCGHSA enrichment
  8. 2026-07-28 01:15 UTCGHSA enrichment
  9. 2026-07-27 21:00 UTCGHSA enrichment
  10. 2026-07-27 16:44 UTCEG score recompute
  11. 2026-07-27 16:44 UTCGHSA enrichment
  12. 2026-07-27 12:07 UTCGHSA enrichment
  13. 2026-07-27 07:53 UTCGHSA enrichment
  14. 2026-07-27 03:37 UTCGHSA enrichment
  15. 2026-07-26 23:22 UTCGHSA enrichment
  16. 2026-07-26 19:06 UTCEG score recompute
  17. 2026-07-26 19:06 UTCGHSA enrichment
  18. 2026-07-26 14:54 UTCEPSS rescore
  19. 2026-07-26 14:54 UTCEPSS rescore
  20. 2026-07-26 14:50 UTCGHSA enrichment
  21. 2026-07-26 10:32 UTCEG score recompute
  22. 2026-07-26 10:31 UTCGHSA enrichment
  23. 2026-07-26 10:30 UTCGHSA enrichment
  24. 2026-07-26 04:21 UTCEG score recompute
  25. 2026-07-26 04:20 UTCGHSA enrichment
Show 15 more
  1. 2026-07-25 14:18 UTCEPSS rescore
  2. 2026-07-25 14:17 UTCEPSS rescore
  3. 2026-07-24 14:17 UTCEPSS rescore
  4. 2026-07-23 14:18 UTCEPSS rescore
  5. 2026-07-23 14:18 UTCEPSS rescore
  6. 2026-07-23 03:08 UTCEG score recompute
  7. 2026-07-22 23:08 UTCEG score recompute
  8. 2026-07-22 23:08 UTCGHSA enrichment
  9. 2026-07-22 14:08 UTCEPSS rescore
  10. 2026-07-22 14:08 UTCEPSS rescore
  11. 2026-07-21 20:55 UTCEG score recompute
  12. 2026-07-21 20:55 UTCGHSA enrichment
  13. 2026-07-21 17:21 UTCEG score recompute
  14. 2026-07-21 16:00 UTCEG score recompute
  15. 2026-07-21 15:58 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-28313?
CVE-2026-28313 is a critical vulnerability published on July 21, 2026. 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.
When was CVE-2026-28313 disclosed?
CVE-2026-28313 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-2026-28313 actively exploited?
CVE-2026-28313 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 73.0% of all scored CVEs.
What is the CVSS score of CVE-2026-28313?
CVE-2026-28313 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-28313?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28313, 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

Explore the affected products and dependency analysis for CVE-2026-28313

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