CVE-2026-50515

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreMEDIUM confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-07. The CNA's CVSS baseline 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.7%CVSS: 9.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Deserialization of untrusted data in Azure Service Bus allows an authorized attacker to execute code over a network.

CVSS v3
9.9
EG Score
9.9CRITICALmedium confidence
EG Risk
45
EG Risk 45/100CISA 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
Severity99% × 45%
Exploitation2% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
1.7%
EPSS %ILE
76th
KEV
Not listed

CISA SSVCTrack 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). 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 6, 2026

Last Modified

September 29, 2026

Advisory Details (1)

Auto-updated Sep 29, 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-2026-50515

Vendor Advisories for CVE-2026-50515(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 45× in last 7d / 265× 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 699 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-50515?
CVE-2026-50515 is a critical vulnerability published on August 6, 2026. Deserialization of untrusted data in Azure Service Bus allows an authorized attacker to execute code over a network.
When was CVE-2026-50515 disclosed?
CVE-2026-50515 was first published on August 6, 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-2026-50515 actively exploited?
CVE-2026-50515 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.7% probability of exploitation in the next 30 days (76th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-50515?
CVE-2026-50515 has a CVSS base score of 9.9 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-50515?
A fix for CVE-2026-50515 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-50515 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-50515

Explore →

Is Your Infrastructure Affected by CVE-2026-50515?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs