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: 0.7%CVSS: 8.0Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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
8.0HIGHmedium confidence
EG Risk
52
EG Risk 52/100CISA 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
Severity80% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
51st
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (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 11, 2026

Last Modified

September 29, 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 32× in last 7d / 151× 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 391 total refreshes for this CVE.

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

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCZeroDayEvil/CVE-2026-62911
    First seen Sep 28, 2026
    Open source ↗
  • GitHub PoChypnguyen1209/CVE-2026-62911
    First seen Aug 22, 2026

    POC pre-auth RCE on Exchange

    Open source ↗

Related CVEs(same CWE)

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 on August 11, 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-2026-62911 actively exploited?
CVE-2026-62911 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (51st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-62911?
CVE-2026-62911 has a CVSS base score of 8.0 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-62911?
A fix for CVE-2026-62911 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-62911 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-62911

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