CVE-2026-47303

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 56% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cna:microsoft, epss
Trending — 3 sources updated this week
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.8Exploit: NoneExposed: 0

A fix is available — apply it.

Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

CVSS v3
8.8
EG Score
8.8(medium)
EPSS
44.2%
KEV
Not listed

Published

July 14, 2026

Last Modified

July 21, 2026

Advisory Details (1)

Auto-updated Jul 14, 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-2026-47303

Vendor Advisories for CVE-2026-47303(4)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntunetstandard-targeting-pack-2.1-8.0 (8.0.129-0ubuntu1~24.04.1) @ noble2026-07-19ubuntu
redhatdotnet9-0-main-9.0.119-1.hum12026-07-15redhat
redhatdotnet10-0-main-10.0.109-1.hum12026-06-17redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(3)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 15× in last 7d / 19× 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. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:24 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
  4. 2026-07-19 14:31 UTCEPSS rescore
  5. 2026-07-19 02:40 UTCEG score recompute
  6. 2026-07-19 02:40 UTCVendor advisory
  7. 2026-07-19 02:29 UTCEPSS rescore
  8. 2026-07-18 10:04 UTCEPSS rescore
  9. 2026-07-17 07:16 UTCEG score recompute
  10. 2026-07-17 07:16 UTCVendor advisory
  11. 2026-07-16 21:34 UTCVendor advisory
  12. 2026-07-16 17:03 UTCEPSS rescore
  13. 2026-07-16 08:57 UTCVendor advisory
  14. 2026-07-15 20:20 UTCVendor advisory
  15. 2026-07-15 16:57 UTCEPSS rescore
  16. 2026-07-15 07:43 UTCVendor advisory
  17. 2026-07-14 19:02 UTCEG score recompute
  18. 2026-07-14 19:02 UTCVendor advisory
  19. 2026-07-14 19:00 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-47303?
CVE-2026-47303 is a high vulnerability published on July 14, 2026. Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
When was CVE-2026-47303 disclosed?
CVE-2026-47303 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-47303 actively exploited?
CVE-2026-47303 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 44.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-47303?
CVE-2026-47303 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-47303?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-47303, 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-2026-47303

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