CVE-2026-66803

CRITICALPre-NVD 10.010.0—
EchelonGraph scoreHIGH confidence

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-30. a secondary CVSS source baseline 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
Trending — 4 sources updated this week
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 10.0Exploit: None knownExposed: 0

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

Improper access control in Azure Cosmos DB allows an unauthorized attacker to execute code over a network.

CVSS v3
10.0
EG Score
10.0(high)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity100% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

Published

July 30, 2026

Last Modified

July 31, 2026

Advisory Details (1)

Auto-updated Jul 31, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66803

Vendor Advisories for CVE-2026-66803(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.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 23× in last 7d / 23× 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 23:00 UTCVendor advisory
  2. 2026-07-31 23:00 UTCGHSA enrichment
  3. 2026-07-31 19:17 UTCVendor advisory
  4. 2026-07-31 19:17 UTCGHSA enrichment
  5. 2026-07-31 15:33 UTCVendor advisory
  6. 2026-07-31 15:32 UTCGHSA enrichment
  7. 2026-07-31 11:47 UTCVendor advisory
  8. 2026-07-31 11:47 UTCGHSA enrichment
  9. 2026-07-31 08:03 UTCVendor advisory
  10. 2026-07-31 08:03 UTCGHSA enrichment
  11. 2026-07-31 04:19 UTCEG score recompute
  12. 2026-07-31 04:19 UTCVendor advisory
  13. 2026-07-31 04:19 UTCGHSA enrichment
  14. 2026-07-31 04:07 UTCEG score recompute
  15. 2026-07-31 04:07 UTCVendor advisory
  16. 2026-07-31 04:07 UTCGHSA enrichment
  17. 2026-07-31 02:03 UTCVendor advisory
  18. 2026-07-31 02:03 UTCGHSA enrichment
  19. 2026-07-30 22:20 UTCEG score recompute
  20. 2026-07-30 22:20 UTCGHSA enrichment
  21. 2026-07-30 21:27 UTCEG score recompute
  22. 2026-07-30 20:38 UTCEG score recompute
  23. 2026-07-30 20:36 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

Frequently asked(4)

What is CVE-2026-66803?
CVE-2026-66803 is a critical vulnerability published on July 30, 2026. Improper access control in Azure Cosmos DB allows an unauthorized attacker to execute code over a network.
When was CVE-2026-66803 disclosed?
CVE-2026-66803 was first published in the National Vulnerability Database on July 30, 2026, with the most recent update on July 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-66803?
CVE-2026-66803 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-66803?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66803, 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-2026-66803

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