CVE-2026-45498

CRITICALNVD 7.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-05-20), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.5 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 63%CVSS: 7.5Exploit: cisa kev · ssvc active · epss top5pct · epss highExposed: 0

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

Microsoft Defender Denial of Service Vulnerability

CVSS v3
7.5
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
63%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

May 20, 2026

Last Modified

August 10, 2026

Advisory Details (1)

Auto-updated Jun 15, 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-2026-45498

Vendor Advisories for CVE-2026-45498(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 94× in last 7d / 386× 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 1,237 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2026-45498?
CVE-2026-45498 is a critical vulnerability published on May 20, 2026. Microsoft Defender Denial of Service Vulnerability
When was CVE-2026-45498 disclosed?
CVE-2026-45498 was first published in the National Vulnerability Database on May 20, 2026, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45498 actively exploited?
Yes. CISA added CVE-2026-45498 to the Known Exploited Vulnerabilities catalog on May 20, 2026, affecting Microsoft Defender. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-45498?
CVE-2026-45498 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2026-45498?
CVE-2026-45498 affects Microsoft Defender. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-45498?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45498, 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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