CVE-2026-62911

HIGHPre-NVD 8.08.0—
EchelonGraph scoreMEDIUM confidence

Score 8.0 from GitHub Security Advisory (severity: HIGH) published 2026-08-11. the CNA's CVSS baseline 8.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this weekElevated
8.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.0Exploit: Elevated riskExposed: 0

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

Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

CVSS v3
8.0
EG Score
8.0(medium)
EG Risk
52(Track*)
EG Risk 52/100SSVC: 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
Severity80% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
70%
KEV
Not listed

Published

August 11, 2026

Last Modified

September 16, 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-2026-62911

Vendor Advisories for CVE-2026-62911(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 38× in last 7d / 197× 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 322 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoChypnguyen1209/CVE-2026-62911
    First seen Aug 22, 2026

    POC pre-auth RCE on Exchange

    Open source ↗

Frequently asked(5)

What is CVE-2026-62911?
CVE-2026-62911 is a high vulnerability published on August 11, 2026. Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
When was CVE-2026-62911 disclosed?
CVE-2026-62911 was first published in the National Vulnerability Database on August 11, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-62911 actively exploited?
CVE-2026-62911 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 30.4% of all scored CVEs.
What is the CVSS score of CVE-2026-62911?
CVE-2026-62911 has a CVSS v4.0 base score of 8.0 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-62911?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-62911, 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-2026-62911

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