CVE-2026-45484

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-09. the CNA's CVSS baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this weekElevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 35%CVSS: 8.8Exploit: Elevated riskExposed: 0

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

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
56(Track)
EG Risk 56/100SSVC: Track

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%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
35%
EPSS %ILE
98%
KEV
Not listed

Published

June 9, 2026

Last Modified

August 25, 2026

Advisory Details (1)

Auto-updated Jun 9, 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-2026-45484

Vendor Advisories for CVE-2026-45484(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 17× in last 7d / 118× 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 316 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-45484?
CVE-2026-45484 is a high vulnerability published on June 9, 2026. Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.
When was CVE-2026-45484 disclosed?
CVE-2026-45484 was first published in the National Vulnerability Database on June 9, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45484 actively exploited?
CVE-2026-45484 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 35% probability of exploitation in the next 30 days, which ranks it in the top 1.6% of all scored CVEs.
What is the CVSS score of CVE-2026-45484?
CVE-2026-45484 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-45484?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45484, 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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