CVE-2026-69356

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreHIGH confidence

Score 9.3 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-08. The CNA's CVSS baseline 9.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 9.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

CVSS v3
9.3
EG Score
9.3CRITICALhigh confidence
EG Risk
42
EG Risk 42/100CISA 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
Severity93% × 45%
Exploitation1% × 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
0.8%
EPSS %ILE
53rd
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

September 8, 2026

Last Modified

October 1, 2026

Advisory Details (1)

Auto-updated Oct 2, 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-2026-69356

Vendor Advisories for CVE-2026-69356(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 103× in last 7d / 392× 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 392 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-69356?
CVE-2026-69356 is a critical vulnerability published on September 8, 2026. Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
When was CVE-2026-69356 disclosed?
CVE-2026-69356 was first published on September 8, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-69356 actively exploited?
CVE-2026-69356 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (53rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-69356?
CVE-2026-69356 has a CVSS base score of 9.3 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-69356?
A fix for CVE-2026-69356 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-69356 are linked in the Vendor Advisories panel on this page.

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