CVE-2026-45484

HIGHPre-NVD 8.88.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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: the CNA's CVSS, EPSS, GitHub Security Advisory
8.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.3%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
41
EG Risk 41/100

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 (value × EchelonGraph’s weight)
Severity88% × 45%
The EG Score, 8.8 of 10.
Exploitation2.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
2.3%
EPSS %ILE
82nd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 9, 2026

Last Modified

September 24, 2026

Advisory Details (1)

Auto-updated Jun 9, 2026
Patch available. Sources: microsoft.
MicrosoftMentions a patch (unverified)

Security Update Guide - Microsoft Security Response Center

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 11× in last 7d / 29× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 360 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 260 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-12 16:34 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  2. 2026-10-12 16:04 UTCEG score recompute
  3. 2026-10-11 19:46 UTCEG score recompute
  4. 2026-10-11 17:01 UTCEG score recompute
  5. 2026-10-11 14:26 UTCEG score recompute
  6. 2026-10-11 13:48 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  7. 2026-10-10 20:00 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  8. 2026-10-09 20:07 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  9. 2026-10-08 17:12 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  10. 2026-10-07 23:48 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  11. 2026-10-06 15:18 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  12. 2026-10-05 17:43 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  13. 2026-10-04 23:22 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  14. 2026-10-03 14:25 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  15. 2026-10-01 19:50 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  16. 2026-09-30 15:03 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  17. 2026-09-27 13:48 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  18. 2026-09-26 15:58 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  19. 2026-09-24 14:07 UTCEG score recompute
  20. 2026-09-24 14:07 UTCVendor advisory
  21. 2026-09-24 14:07 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  22. 2026-09-23 17:53 UTCEPSS rescoreEPSS 35% · 98th percentile
  23. 2026-09-18 19:28 UTCEPSS rescoreEPSS 35% · 98th percentile
  24. 2026-09-17 19:31 UTCEPSS rescoreEPSS 35% · 98th percentile
  25. 2026-09-16 14:08 UTCEPSS rescoreEPSS 35% · 98th percentile
Show 75 more
  1. 2026-09-16 05:15 UTCEPSS rescoreEPSS 35% · 98th percentile
  2. 2026-09-14 04:27 UTCEG score recompute
  3. 2026-09-14 04:27 UTCVendor advisory
  4. 2026-09-14 04:27 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  5. 2026-09-12 15:01 UTCEPSS rescoreEPSS 35% · 98th percentile
  6. 2026-09-11 14:53 UTCEPSS rescoreEPSS 35% · 98th percentile
  7. 2026-09-11 09:37 UTCEPSS rescoreEPSS 35% · 98th percentile
  8. 2026-09-10 09:34 UTCEPSS rescoreEPSS 35% · 98th percentile
  9. 2026-09-08 22:00 UTCEPSS rescoreEPSS 35% · 98th percentile
  10. 2026-09-07 16:01 UTCEPSS rescoreEPSS 35% · 98th percentile
  11. 2026-09-06 13:47 UTCEPSS rescoreEPSS 35% · 98th percentile
  12. 2026-09-04 05:06 UTCEPSS rescoreEPSS 35% · 98th percentile
  13. 2026-09-02 14:12 UTCEPSS rescoreEPSS 35% · 98th percentile
  14. 2026-09-01 13:54 UTCEPSS rescoreEPSS 35% · 98th percentile
  15. 2026-08-31 00:47 UTCEG score recompute
  16. 2026-08-31 00:47 UTCVendor advisory
  17. 2026-08-31 00:47 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  18. 2026-08-30 19:17 UTCEPSS rescoreEPSS 35% · 98th percentile
  19. 2026-08-30 01:22 UTCEPSS rescoreEPSS 35% · 98th percentile
  20. 2026-08-28 21:41 UTCEPSS rescoreEPSS 35% · 98th percentile
  21. 2026-08-26 14:46 UTCEPSS rescoreEPSS 35% · 98th percentile
  22. 2026-08-25 23:04 UTCEG score recompute
  23. 2026-08-25 23:04 UTCVendor advisory
  24. 2026-08-25 23:04 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  25. 2026-08-25 13:49 UTCEPSS rescoreEPSS 35% · 98th percentile
  26. 2026-08-25 03:17 UTCVendor advisory
  27. 2026-08-25 03:17 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  28. 2026-08-24 15:36 UTCEG score recompute
  29. 2026-08-24 15:36 UTCVendor advisory
  30. 2026-08-24 15:36 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  31. 2026-08-23 23:31 UTCVendor advisory
  32. 2026-08-23 23:31 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  33. 2026-08-23 11:09 UTCEG score recompute
  34. 2026-08-23 11:09 UTCVendor advisory
  35. 2026-08-23 11:09 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  36. 2026-08-23 00:19 UTCEPSS rescoreEPSS 35% · 98th percentile
  37. 2026-08-21 23:49 UTCEPSS rescoreEPSS 35% · 98th percentile
  38. 2026-08-21 19:45 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  39. 2026-08-21 08:14 UTCEG score recompute
  40. 2026-08-21 08:14 UTCVendor advisory
  41. 2026-08-21 08:14 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  42. 2026-08-20 22:55 UTCEPSS rescoreEPSS 35% · 98th percentile
  43. 2026-08-20 20:33 UTCVendor advisory
  44. 2026-08-20 20:33 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  45. 2026-08-20 08:59 UTCEG score recompute
  46. 2026-08-20 08:59 UTCVendor advisory
  47. 2026-08-20 08:59 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  48. 2026-08-19 17:04 UTCEPSS rescoreEPSS 35% · 98th percentile
  49. 2026-08-18 13:48 UTCEPSS rescoreEPSS 35% · 98th percentile
  50. 2026-08-17 13:45 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  51. 2026-08-17 02:15 UTCEG score recompute
  52. 2026-08-17 02:15 UTCVendor advisory
  53. 2026-08-17 02:15 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  54. 2026-08-16 14:56 UTCEPSS rescoreEPSS 35% · 98th percentile
  55. 2026-08-16 14:44 UTCVendor advisory
  56. 2026-08-16 14:44 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  57. 2026-08-16 03:08 UTCEG score recompute
  58. 2026-08-16 03:08 UTCVendor advisory
  59. 2026-08-16 03:08 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  60. 2026-08-16 02:14 UTCEPSS rescoreEPSS 35% · 98th percentile
  61. 2026-08-15 15:37 UTCVendor advisory
  62. 2026-08-15 15:37 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  63. 2026-08-15 04:04 UTCEG score recompute
  64. 2026-08-15 04:04 UTCVendor advisory
  65. 2026-08-15 04:04 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  66. 2026-08-15 01:30 UTCEPSS rescoreEPSS 35% · 98th percentile
  67. 2026-08-14 16:33 UTCVendor advisory
  68. 2026-08-14 16:33 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  69. 2026-08-14 08:30 UTCEG score recompute
  70. 2026-08-14 08:30 UTCVendor advisory
  71. 2026-08-14 08:30 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  72. 2026-08-13 22:00 UTCEPSS rescoreEPSS 35% · 98th percentile
  73. 2026-08-13 20:59 UTCVendor advisory
  74. 2026-08-13 20:59 UTCGHSA enrichmentGHSA-v99j-98xx-cvgv · GitHub severity HIGH · GitHub CVSS 8.8
  75. 2026-08-13 12:23 UTCVendor advisory

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-45484?
CVE-2026-45484 is a high-severity vulnerability; its CVE record was 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 made public?
CVE-2026-45484 was made public on June 9, 2026: that is the date its CVE record's CNA, Microsoft Corporation, gives for when the vulnerability was made public. The CVE record itself was published on June 9, 2026. EchelonGraph's copy of the record carries a last-modified date of September 24, 2026; the record at its source may have been updated since.
Is CVE-2026-45484 actively exploited?
CVE-2026-45484 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.3% probability of exploitation in the next 30 days (82nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-45484?
CVE-2026-45484 has a CVSS base score of 8.8 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-45484?
A fix for CVE-2026-45484 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-45484 are linked in the Vendor Advisories panel on this page.

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