CVE-2026-33825

CRITICALPre-NVD 7.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-04-22), indicating real-world exploitation has been confirmed by US federal agencies. the CNA's CVSS baseline 7.8 retained for reference (NVD's own analysis pending). Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, cna:microsoft, epss, ghsa
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: 7%CVSS: 7.8Exploit: cisa kev · ssvc active · kev ransomware · public exploitExposed: 0

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

Insufficient granularity of access control in Microsoft Defender allows an authorized attacker to elevate privileges locally.

CVSS v3
7.8
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
7%
EPSS %ILE
94%
KEV
⚠ Exploited

Published

April 14, 2026

Last Modified

August 14, 2026

Advisory Details (3)

Auto-updated May 19, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: microsoft, cisa.
generic🔴 Active Exploitation

Nightmare-Eclipse Tooling Seen in Real-World Intrusion | Huntress

https://www.huntress.com/blog/nightmare-eclipse-intrusion
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-33825
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-2026-33825

Vendor Advisories for CVE-2026-33825(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.

Data Freshness Timeline

(refreshed 103× in last 7d / 428× 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 1,535 total refreshes for this CVE.

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

Publicly available exploits

(3 references)

Working exploit code is in the public domain (3 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoC0xBlackash/CVE-2026-33825
    First seen May 18, 2026

    CVE-2026-33825

    Open source ↗
  • GitHub PoCJoe1sn/CVE-2026-33825
    First seen May 2, 2026

    RedSun PoC for self use

    Open source ↗
  • GitHub PoCLetlaka/redsun-bluehammer-undefend-detection-pack
    First seen Apr 17, 2026

    Microsoft Defender XDR KQL detections for RedSun, BlueHammer, UnDefend, and CVE-2026-33825-related Defender abuse behaviors.

    Open source ↗

Frequently asked(6)

What is CVE-2026-33825?
CVE-2026-33825 is a critical vulnerability published on April 14, 2026. Insufficient granularity of access control in Microsoft Defender allows an authorized attacker to elevate privileges locally.
When was CVE-2026-33825 disclosed?
CVE-2026-33825 was first published in the National Vulnerability Database on April 14, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33825 actively exploited?
Yes. CISA added CVE-2026-33825 to the Known Exploited Vulnerabilities catalog on April 22, 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-2026-33825?
CVE-2026-33825 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2026-33825?
CVE-2026-33825 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-2026-33825?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33825, 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-2026-33825

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