CVE-2026-54990

CRITICALNVD 8.89.8▲
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-14. NVD baseline CVSS 8.8; sources differ by 1.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

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

Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

CVSS v3
8.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
54%
KEV
Not listed

Published

July 14, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Jul 18, 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-2026-54990

Vendor Advisories for CVE-2026-54990(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 57× in last 7d / 335× 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 458 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-54990?
CVE-2026-54990 is a critical vulnerability published on July 14, 2026. Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
When was CVE-2026-54990 disclosed?
CVE-2026-54990 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54990 actively exploited?
CVE-2026-54990 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 45.7% of all scored CVEs.
What is the CVSS score of CVE-2026-54990?
CVE-2026-54990 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.
How do I remediate CVE-2026-54990?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54990, 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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