CVE-2026-66315

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-04. the CNA's CVSS baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 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 unauthorized attacker to execute code over a network.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

August 3, 2026

Last Modified

August 20, 2026

Advisory Details (1)

Auto-updated Aug 3, 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-2026-66315

Vendor Advisories for CVE-2026-66315(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 51× in last 7d / 124× 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 124 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-66315?
CVE-2026-66315 is a high vulnerability published on August 3, 2026. Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
When was CVE-2026-66315 disclosed?
CVE-2026-66315 was first published in the National Vulnerability Database on August 3, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66315 actively exploited?
CVE-2026-66315 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 53.5% of all scored CVEs.
What is the CVSS score of CVE-2026-66315?
CVE-2026-66315 has a CVSS v4.0 base score of 7.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-66315?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66315, 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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