CVE-2026-66312

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 1.1% (64th percentile of EPSS-scored CVEs). GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.1%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

Buffer over-read in Microsoft Edge (Chromium-based) allows an authorized attacker to execute code over a network.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA SSVC

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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
1.1%
EPSS %ILE
64th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 3, 2026

Last Modified

October 8, 2026

Advisory Details (1)

Auto-updated Aug 3, 2026
Fix referenced — no release confirmed yet. Sources: microsoft.
microsoftMentions a patch (unverified)

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-2026-66312

Vendor Advisories for CVE-2026-66312(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 20× in last 7d / 119× 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 342 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-66312?
CVE-2026-66312 is a high vulnerability published on August 3, 2026. Buffer over-read in Microsoft Edge (Chromium-based) allows an authorized attacker to execute code over a network.
When was CVE-2026-66312 disclosed?
CVE-2026-66312 was first published on August 3, 2026, with the most recent update on October 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66312 actively exploited?
CVE-2026-66312 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.1% probability of exploitation in the next 30 days (64th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-66312?
CVE-2026-66312 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-66312?
A fix for CVE-2026-66312 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2026-66312 are linked in the Vendor Advisories panel on this page.

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