CVE-2026-69355

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-08. the CNA's CVSS baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
8.8EG
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.

External control of file name or path in Microsoft Exchange Server allows an authorized attacker to execute code over a network.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
56%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 18, 2026

Advisory Details (1)

Auto-updated Sep 8, 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-2026-69355

Vendor Advisories for CVE-2026-69355(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 49× in last 7d / 87× 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.

  1. 2026-09-19 21:23 UTCEG score recompute
  2. 2026-09-19 21:23 UTCVendor advisory
  3. 2026-09-19 21:23 UTCGHSA enrichment
  4. 2026-09-19 09:06 UTCVendor advisory
  5. 2026-09-19 09:05 UTCGHSA enrichment
  6. 2026-09-18 20:48 UTCEG score recompute
  7. 2026-09-18 20:48 UTCVendor advisory
  8. 2026-09-18 20:48 UTCGHSA enrichment
  9. 2026-09-18 19:28 UTCEPSS rescore
  10. 2026-09-18 13:52 UTCVendor advisory
  11. 2026-09-18 13:52 UTCGHSA enrichment
  12. 2026-09-18 11:28 UTCVendor advisory
  13. 2026-09-18 11:28 UTCGHSA enrichment
  14. 2026-09-17 23:10 UTCVendor advisory
  15. 2026-09-17 23:10 UTCGHSA enrichment
  16. 2026-09-17 19:57 UTCEG score recompute
  17. 2026-09-17 19:57 UTCVendor advisory
  18. 2026-09-17 19:57 UTCGHSA enrichment
  19. 2026-09-17 10:34 UTCVendor advisory
  20. 2026-09-17 10:34 UTCGHSA enrichment
  21. 2026-09-16 22:14 UTCEG score recompute
  22. 2026-09-16 22:14 UTCVendor advisory
  23. 2026-09-16 22:14 UTCGHSA enrichment
  24. 2026-09-16 14:08 UTCEPSS rescore
  25. 2026-09-16 11:26 UTCEG score recompute
Show 62 more
  1. 2026-09-16 11:26 UTCVendor advisory
  2. 2026-09-16 11:26 UTCGHSA enrichment
  3. 2026-09-16 05:15 UTCEPSS rescore
  4. 2026-09-15 23:09 UTCVendor advisory
  5. 2026-09-15 23:09 UTCGHSA enrichment
  6. 2026-09-15 18:05 UTCVendor advisory
  7. 2026-09-15 18:05 UTCGHSA enrichment
  8. 2026-09-15 11:36 UTCEG score recompute
  9. 2026-09-15 11:36 UTCVendor advisory
  10. 2026-09-15 11:36 UTCGHSA enrichment
  11. 2026-09-14 23:18 UTCVendor advisory
  12. 2026-09-14 23:18 UTCGHSA enrichment
  13. 2026-09-14 17:22 UTCVendor advisory
  14. 2026-09-14 17:22 UTCGHSA enrichment
  15. 2026-09-14 12:38 UTCVendor advisory
  16. 2026-09-14 12:38 UTCGHSA enrichment
  17. 2026-09-14 00:15 UTCEG score recompute
  18. 2026-09-14 00:15 UTCVendor advisory
  19. 2026-09-14 00:15 UTCGHSA enrichment
  20. 2026-09-13 11:58 UTCVendor advisory
  21. 2026-09-13 11:58 UTCGHSA enrichment
  22. 2026-09-12 23:40 UTCEG score recompute
  23. 2026-09-12 23:40 UTCVendor advisory
  24. 2026-09-12 23:40 UTCGHSA enrichment
  25. 2026-09-12 11:22 UTCVendor advisory
  26. 2026-09-12 11:22 UTCGHSA enrichment
  27. 2026-09-11 23:04 UTCVendor advisory
  28. 2026-09-11 23:04 UTCGHSA enrichment
  29. 2026-09-11 19:45 UTCVendor advisory
  30. 2026-09-11 19:45 UTCGHSA enrichment
  31. 2026-09-11 17:07 UTCEG score recompute
  32. 2026-09-11 17:07 UTCVendor advisory
  33. 2026-09-11 17:07 UTCGHSA enrichment
  34. 2026-09-11 14:53 UTCEPSS rescore
  35. 2026-09-11 11:59 UTCEG score recompute
  36. 2026-09-11 11:59 UTCGHSA enrichment
  37. 2026-09-11 09:37 UTCEPSS rescore
  38. 2026-09-10 23:41 UTCGHSA enrichment
  39. 2026-09-10 22:08 UTCGHSA enrichment
  40. 2026-09-10 09:51 UTCEG score recompute
  41. 2026-09-10 09:51 UTCGHSA enrichment
  42. 2026-09-09 21:33 UTCVendor advisory
  43. 2026-09-09 21:33 UTCGHSA enrichment
  44. 2026-09-09 20:15 UTCVendor advisory
  45. 2026-09-09 20:15 UTCGHSA enrichment
  46. 2026-09-09 10:20 UTCVendor advisory
  47. 2026-09-09 10:20 UTCGHSA enrichment
  48. 2026-09-09 04:37 UTCVendor advisory
  49. 2026-09-09 04:37 UTCGHSA enrichment
  50. 2026-09-09 04:11 UTCEG score recompute
  51. 2026-09-09 04:11 UTCVendor advisory
  52. 2026-09-09 04:10 UTCGHSA enrichment
  53. 2026-09-09 00:11 UTCEG score recompute
  54. 2026-09-09 00:11 UTCVendor advisory
  55. 2026-09-09 00:11 UTCGHSA enrichment
  56. 2026-09-08 19:42 UTCEG score recompute
  57. 2026-09-08 19:42 UTCGHSA enrichment
  58. 2026-09-08 19:08 UTCEG score recompute
  59. 2026-09-08 19:08 UTCGHSA enrichment
  60. 2026-09-08 17:59 UTCEG score recompute
  61. 2026-09-08 17:59 UTCVendor advisory
  62. 2026-09-08 17:25 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-69355?
CVE-2026-69355 is a high vulnerability published on September 8, 2026. External control of file name or path in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
When was CVE-2026-69355 disclosed?
CVE-2026-69355 was first published in the National Vulnerability Database on September 8, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-69355 actively exploited?
CVE-2026-69355 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 43.6% of all scored CVEs.
What is the CVSS score of CVE-2026-69355?
CVE-2026-69355 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-69355?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-69355, 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

Explore the affected products and dependency analysis for CVE-2026-69355

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