CVE-2026-54123

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-08-11. The CNA's CVSS baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Exposure of sensitive information to an unauthorized actor in Microsoft Defender for Endpoint allows an authorized attacker to disclose information locally.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100CISA SSVC

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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
39th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 11, 2026

Last Modified

September 29, 2026

Advisory Details (1)

Auto-updated Aug 11, 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-2026-54123

Vendor Advisories for CVE-2026-54123(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 21× in last 7d / 103× 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 275 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54123?
CVE-2026-54123 is a medium vulnerability published on August 11, 2026. Exposure of sensitive information to an unauthorized actor in Microsoft Defender for Endpoint allows an authorized attacker to disclose information locally.
When was CVE-2026-54123 disclosed?
CVE-2026-54123 was first published on August 11, 2026, with the most recent update on September 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54123 actively exploited?
CVE-2026-54123 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (39th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54123?
CVE-2026-54123 has a CVSS base score of 5.5 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-54123?
A fix for CVE-2026-54123 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54123 are linked in the Vendor Advisories panel on this page.

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