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 — 6 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

July 23, 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 65× in last 7d / 354× 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 731 total refreshes for this CVE.

  1. 2026-07-28 02:59 UTCVendor advisory
  2. 2026-07-28 02:58 UTCGHSA enrichment
  3. 2026-07-27 22:55 UTCVendor advisory
  4. 2026-07-27 22:55 UTCGHSA enrichment
  5. 2026-07-27 19:24 UTCCISA KEV update
  6. 2026-07-27 18:51 UTCVendor advisory
  7. 2026-07-27 18:51 UTCGHSA enrichment
  8. 2026-07-27 17:17 UTCCISA KEV update
  9. 2026-07-27 14:46 UTCVendor advisory
  10. 2026-07-27 14:46 UTCGHSA enrichment
  11. 2026-07-27 10:04 UTCVendor advisory
  12. 2026-07-27 10:04 UTCGHSA enrichment
  13. 2026-07-27 06:01 UTCVendor advisory
  14. 2026-07-27 06:01 UTCGHSA enrichment
  15. 2026-07-27 01:55 UTCVendor advisory
  16. 2026-07-27 01:55 UTCGHSA enrichment
  17. 2026-07-26 21:51 UTCVendor advisory
  18. 2026-07-26 21:51 UTCGHSA enrichment
  19. 2026-07-26 17:49 UTCEG score recompute
  20. 2026-07-26 17:49 UTCVendor advisory
  21. 2026-07-26 17:48 UTCGHSA enrichment
  22. 2026-07-26 14:54 UTCEPSS rescore
  23. 2026-07-26 14:54 UTCEPSS rescore
  24. 2026-07-26 13:45 UTCEG score recompute
  25. 2026-07-26 13:45 UTCVendor advisory
Show 75 more
  1. 2026-07-26 13:45 UTCGHSA enrichment
  2. 2026-07-26 09:42 UTCVendor advisory
  3. 2026-07-26 09:42 UTCGHSA enrichment
  4. 2026-07-26 05:39 UTCVendor advisory
  5. 2026-07-26 05:39 UTCGHSA enrichment
  6. 2026-07-26 01:36 UTCEG score recompute
  7. 2026-07-26 01:36 UTCVendor advisory
  8. 2026-07-26 01:36 UTCGHSA enrichment
  9. 2026-07-25 14:18 UTCEPSS rescore
  10. 2026-07-24 14:17 UTCEPSS rescore
  11. 2026-07-23 14:18 UTCEPSS rescore
  12. 2026-07-23 13:52 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  13. 2026-07-23 03:16 UTCEG score recompute
  14. 2026-07-22 21:58 UTCEG score recompute
  15. 2026-07-22 21:58 UTCVendor advisory
  16. 2026-07-22 21:58 UTCGHSA enrichment
  17. 2026-07-22 19:40 UTCCISA KEV update
  18. 2026-07-22 17:55 UTCEG score recompute
  19. 2026-07-22 17:55 UTCGHSA enrichment
  20. 2026-07-22 14:08 UTCEPSS rescore
  21. 2026-07-22 13:50 UTCGHSA enrichment
  22. 2026-07-22 09:48 UTCVendor advisory
  23. 2026-07-22 09:48 UTCGHSA enrichment
  24. 2026-07-22 05:44 UTCVendor advisory
  25. 2026-07-22 05:44 UTCGHSA enrichment
  26. 2026-07-22 01:41 UTCVendor advisory
  27. 2026-07-22 01:40 UTCGHSA enrichment
  28. 2026-07-21 21:38 UTCVendor advisory
  29. 2026-07-21 21:37 UTCGHSA enrichment
  30. 2026-07-21 17:34 UTCEG score recompute
  31. 2026-07-21 17:34 UTCVendor advisory
  32. 2026-07-21 17:34 UTCGHSA enrichment
  33. 2026-07-21 15:24 UTCEPSS rescore
  34. 2026-07-21 14:37 UTCCISA KEV update
  35. 2026-07-21 13:31 UTCVendor advisory
  36. 2026-07-21 13:31 UTCGHSA enrichment
  37. 2026-07-21 09:28 UTCVendor advisory
  38. 2026-07-21 09:28 UTCGHSA enrichment
  39. 2026-07-21 05:25 UTCVendor advisory
  40. 2026-07-21 05:24 UTCGHSA enrichment
  41. 2026-07-21 01:22 UTCVendor advisory
  42. 2026-07-21 01:22 UTCGHSA enrichment
  43. 2026-07-20 21:18 UTCVendor advisory
  44. 2026-07-20 21:18 UTCGHSA enrichment
  45. 2026-07-20 17:14 UTCEG score recompute
  46. 2026-07-20 17:14 UTCVendor advisory
  47. 2026-07-20 17:14 UTCGHSA enrichment
  48. 2026-07-20 17:08 UTCEPSS rescore
  49. 2026-07-20 13:10 UTCGHSA enrichment
  50. 2026-07-20 09:06 UTCVendor advisory
  51. 2026-07-20 09:06 UTCGHSA enrichment
  52. 2026-07-20 05:02 UTCVendor advisory
  53. 2026-07-20 05:02 UTCGHSA enrichment
  54. 2026-07-20 00:59 UTCVendor advisory
  55. 2026-07-19 20:55 UTCVendor advisory
  56. 2026-07-19 20:55 UTCGHSA enrichment
  57. 2026-07-19 16:52 UTCVendor advisory
  58. 2026-07-19 16:52 UTCGHSA enrichment
  59. 2026-07-19 12:49 UTCVendor advisory
  60. 2026-07-19 12:49 UTCGHSA enrichment
  61. 2026-07-19 08:47 UTCVendor advisory
  62. 2026-07-19 08:47 UTCGHSA enrichment
  63. 2026-07-19 04:44 UTCEG score recompute
  64. 2026-07-19 04:44 UTCVendor advisory
  65. 2026-07-19 04:44 UTCGHSA enrichment
  66. 2026-07-19 02:29 UTCEPSS rescore
  67. 2026-07-19 00:40 UTCGHSA enrichment
  68. 2026-07-18 20:38 UTCVendor advisory
  69. 2026-07-18 20:38 UTCGHSA enrichment
  70. 2026-07-18 16:35 UTCVendor advisory
  71. 2026-07-18 16:34 UTCGHSA enrichment
  72. 2026-07-18 12:32 UTCVendor advisory
  73. 2026-07-18 12:32 UTCGHSA enrichment
  74. 2026-07-18 08:29 UTCVendor advisory
  75. 2026-07-18 08:29 UTCGHSA enrichment

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 July 23, 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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