CVE-2026-50521

HIGHPre-NVD 8.38.3—
EchelonGraph scoreHIGH confidence

Score 8.3 from GitHub Security Advisory (severity: HIGH) published 2026-07-01. a secondary CVSS source baseline 8.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.3
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.3Exploit: NoneExposed: 0

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

Use after free in Microsoft Edge (Chromium-based) allows an authorized attacker to execute code over a network.

CVSS v3
8.3
EG Score
8.3(high)
EPSS
52.9%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 3, 2026

Advisory Details (1)

Auto-updated Jul 2, 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-2026-50521

Vendor Advisories for CVE-2026-50521(2)

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 40× 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. 2026-07-06 23:34 UTCEG score recompute
  2. 2026-07-06 23:34 UTCVendor advisory
  3. 2026-07-06 23:34 UTCGHSA enrichment
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 12:31 UTCEG score recompute
  6. 2026-07-06 12:31 UTCVendor advisory
  7. 2026-07-06 12:31 UTCGHSA enrichment
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-06 01:29 UTCEG score recompute
  10. 2026-07-06 01:29 UTCVendor advisory
  11. 2026-07-06 01:29 UTCGHSA enrichment
  12. 2026-07-05 14:26 UTCEG score recompute
  13. 2026-07-05 14:26 UTCVendor advisory
  14. 2026-07-05 14:26 UTCGHSA enrichment
  15. 2026-07-05 03:24 UTCEG score recompute
  16. 2026-07-05 03:24 UTCVendor advisory
  17. 2026-07-05 03:24 UTCGHSA enrichment
  18. 2026-07-05 02:30 UTCEPSS rescore
  19. 2026-07-04 16:21 UTCEG score recompute
  20. 2026-07-04 16:21 UTCVendor advisory
  21. 2026-07-04 16:21 UTCGHSA enrichment
  22. 2026-07-04 06:31 UTCEPSS rescore
  23. 2026-07-04 05:17 UTCEG score recompute
  24. 2026-07-04 05:17 UTCVendor advisory
  25. 2026-07-04 05:17 UTCGHSA enrichment
Show 15 more
  1. 2026-07-03 18:14 UTCEG score recompute
  2. 2026-07-03 18:14 UTCVendor advisory
  3. 2026-07-03 18:14 UTCGHSA enrichment
  4. 2026-07-03 07:11 UTCEG score recompute
  5. 2026-07-03 07:11 UTCVendor advisory
  6. 2026-07-03 07:11 UTCGHSA enrichment
  7. 2026-07-02 20:08 UTCEG score recompute
  8. 2026-07-02 20:08 UTCVendor advisory
  9. 2026-07-02 20:08 UTCGHSA enrichment
  10. 2026-07-02 09:06 UTCEG score recompute
  11. 2026-07-02 09:06 UTCVendor advisory
  12. 2026-07-02 09:06 UTCGHSA enrichment
  13. 2026-07-01 22:02 UTCEG score recompute
  14. 2026-07-01 22:02 UTCVendor advisory
  15. 2026-07-01 22:02 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-50521?
CVE-2026-50521 is a high vulnerability published on July 1, 2026. Use after free in Microsoft Edge (Chromium-based) allows an authorized attacker to execute code over a network.
When was CVE-2026-50521 disclosed?
CVE-2026-50521 was first published in the National Vulnerability Database on July 1, 2026, with the most recent update on July 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50521 actively exploited?
CVE-2026-50521 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 52.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-50521?
CVE-2026-50521 has a CVSS v3 base score of 8.3 (NVD).
How do I remediate CVE-2026-50521?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50521, 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-2026-50521

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