CVE-2026-44817

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-09. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
7.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.8Exploit: 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).

Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100

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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.5%
EPSS %ILE
38th
KEV
Not listed

Published

June 9, 2026

Last Modified

September 24, 2026

Advisory Details (1)

Auto-updated Jun 9, 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-2026-44817

Vendor Advisories for CVE-2026-44817(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 7× in last 7d / 28× 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 357 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-44817?
CVE-2026-44817 is a high vulnerability published on June 9, 2026. Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
When was CVE-2026-44817 disclosed?
CVE-2026-44817 was first published on June 9, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44817 actively exploited?
CVE-2026-44817 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-44817?
CVE-2026-44817 has a CVSS base score of 7.8 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-44817?
A fix for CVE-2026-44817 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-2026-44817 are linked in the Vendor Advisories panel on this page.

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