CVE-2026-45490

HIGHPre-NVD 7.87.8
EchelonGraph scoreMEDIUM confidence

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

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: the CNA's CVSS, EPSS, GitHub Security Advisory
7.8EG
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: 0.4%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Improper authorization in .NET allows an authorized attacker to elevate privileges 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 (value × EchelonGraph’s weight)
Severity78% × 45%
The EG Score, 7.8 of 10.
Exploitation0.4% × 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
0.4%
EPSS %ILE
34th
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-2026-45490

Vendor Advisories for CVE-2026-45490(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 30× 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 364 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 264 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 19:46 UTCEG score recompute
  2. 2026-10-11 17:01 UTCEG score recompute
  3. 2026-10-11 14:26 UTCEG score recompute
  4. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  5. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  6. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  7. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  8. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  9. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  10. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  11. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  12. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  13. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  14. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  15. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  16. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  17. 2026-09-24 14:10 UTCEG score recompute
  18. 2026-09-24 14:10 UTCVendor advisory
  19. 2026-09-24 14:10 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  20. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  21. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  22. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  23. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  24. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  25. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 31st percentile
Show 75 more
  1. 2026-09-14 04:33 UTCEG score recompute
  2. 2026-09-14 04:33 UTCVendor advisory
  3. 2026-09-14 04:33 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  4. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  5. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  6. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  7. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  8. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  9. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  10. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  11. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  12. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  13. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  14. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  15. 2026-08-31 00:52 UTCEG score recompute
  16. 2026-08-31 00:52 UTCVendor advisory
  17. 2026-08-31 00:52 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  18. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  19. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  20. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  21. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  22. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  23. 2026-08-25 23:09 UTCEG score recompute
  24. 2026-08-25 23:09 UTCVendor advisory
  25. 2026-08-25 23:09 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  26. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  27. 2026-08-25 03:57 UTCVendor advisory
  28. 2026-08-25 03:57 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  29. 2026-08-24 15:39 UTCEG score recompute
  30. 2026-08-24 15:39 UTCVendor advisory
  31. 2026-08-24 15:39 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  32. 2026-08-23 23:34 UTCVendor advisory
  33. 2026-08-23 23:34 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  34. 2026-08-23 11:11 UTCEG score recompute
  35. 2026-08-23 11:11 UTCVendor advisory
  36. 2026-08-23 11:11 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  37. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  38. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  39. 2026-08-21 22:46 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  40. 2026-08-21 10:11 UTCEG score recompute
  41. 2026-08-21 10:11 UTCVendor advisory
  42. 2026-08-21 10:11 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  43. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  44. 2026-08-20 21:19 UTCVendor advisory
  45. 2026-08-20 21:19 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  46. 2026-08-20 09:01 UTCEG score recompute
  47. 2026-08-20 09:01 UTCVendor advisory
  48. 2026-08-20 09:01 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  49. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  50. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  51. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  52. 2026-08-17 12:55 UTCVendor advisory
  53. 2026-08-17 12:55 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  54. 2026-08-17 00:37 UTCEG score recompute
  55. 2026-08-17 00:37 UTCVendor advisory
  56. 2026-08-17 00:37 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  57. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  58. 2026-08-16 06:34 UTCEG score recompute
  59. 2026-08-16 06:34 UTCVendor advisory
  60. 2026-08-16 06:34 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  61. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  62. 2026-08-15 18:16 UTCVendor advisory
  63. 2026-08-15 18:16 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  64. 2026-08-15 05:03 UTCEG score recompute
  65. 2026-08-15 05:03 UTCVendor advisory
  66. 2026-08-15 05:03 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  67. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  68. 2026-08-14 16:34 UTCVendor advisory
  69. 2026-08-14 16:34 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  70. 2026-08-14 09:21 UTCEG score recompute
  71. 2026-08-14 09:21 UTCVendor advisory
  72. 2026-08-14 09:21 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8
  73. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  74. 2026-08-13 21:02 UTCVendor advisory
  75. 2026-08-13 21:02 UTCGHSA enrichmentGHSA-77gm-m6x5-jf4f · GitHub severity HIGH · GitHub CVSS 7.8

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-45490?
CVE-2026-45490 is a high-severity vulnerability; its CVE record was published on June 9, 2026. Improper authorization in .NET allows an authorized attacker to elevate privileges locally.
When was CVE-2026-45490 made public?
CVE-2026-45490 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-2026-45490 actively exploited?
CVE-2026-45490 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (34th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-45490?
CVE-2026-45490 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-2026-45490?
A fix for CVE-2026-45490 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-45490 are linked in the Vendor Advisories panel on this page.

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