CVE-2026-65400

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-08-18), indicating real-world exploitation has been confirmed by US federal agencies. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8 retained for reference (NVD's own analysis pending). Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa-adp, cisa_kev, epss, ghsa
Trending — KEV-added this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 1%CVSS: 9.8Exploit: cisa kev · ssvc activeExposed: 0

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

An authentication issue was addressed with improved state management. This issue is fixed in macOS Sequoia 15.7.9, macOS Sonoma 14.8.9, macOS Tahoe 26.6.1. An attacker on the network may be able to authenticate to Screen Sharing without valid credentials.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

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
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
1%
EPSS %ILE
52%
KEV
⚠ Exploited

Published

August 6, 2026

Last Modified

August 19, 2026

Advisory Details (7)

Auto-updated Aug 19, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-65400
generic

NCSC NL | Security Advisories

https://advisories.ncsc.nl/2026/ncsc-2026-0280.html
generic

About the security content of macOS Sonoma 14.8.9 - Apple Support

https://support.apple.com/en-us/148172
generic

About the security content of macOS Sequoia 15.7.9 - Apple Support

https://support.apple.com/en-us/148171
generic

About the security content of macOS Tahoe 26.6.1 - Apple Support

https://support.apple.com/en-us/148170
generic

Full Disclosure: APPLE-SA-08-06-2026-2 macOS Sequoia 15.7.9

http://seclists.org/fulldisclosure/2026/Aug/37
generic

Full Disclosure: APPLE-SA-08-06-2026-3 macOS Sonoma 14.8.9

http://seclists.org/fulldisclosure/2026/Aug/36

Vendor Advisories for CVE-2026-65400(1)

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 69× in last 7d / 102× 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 102 total refreshes for this CVE.

  1. 2026-08-20 19:10 UTCGHSA enrichment
  2. 2026-08-20 17:06 UTCCISA KEV update
  3. 2026-08-20 15:17 UTCGHSA enrichment
  4. 2026-08-20 11:23 UTCGHSA enrichment
  5. 2026-08-20 07:29 UTCGHSA enrichment
  6. 2026-08-20 03:37 UTCGHSA enrichment
  7. 2026-08-19 23:44 UTCGHSA enrichment
  8. 2026-08-19 19:51 UTCEG score recompute
  9. 2026-08-19 19:51 UTCGHSA enrichment
  10. 2026-08-19 17:33 UTCCISA KEV update
  11. 2026-08-19 17:04 UTCEPSS rescore
  12. 2026-08-19 15:57 UTCGHSA enrichment
  13. 2026-08-19 12:04 UTCGHSA enrichment
  14. 2026-08-19 08:11 UTCGHSA enrichment
  15. 2026-08-19 04:18 UTCGHSA enrichment
  16. 2026-08-19 04:09 UTCGHSA enrichment
  17. 2026-08-19 03:50 UTCGHSA enrichment
  18. 2026-08-18 23:56 UTCGHSA enrichment
  19. 2026-08-18 20:03 UTCGHSA enrichment
  20. 2026-08-18 19:41 UTCGHSA enrichment
  21. 2026-08-18 18:22 UTCEG score recompute
  22. 2026-08-18 18:22 UTCGHSA enrichment
  23. 2026-08-18 17:54 UTCGHSA enrichment
  24. 2026-08-18 16:58 UTCEG score recompute
  25. 2026-08-18 16:58 UTCGHSA enrichment
Show 75 more
  1. 2026-08-18 16:58 UTCCISA KEV update
  2. 2026-08-18 13:48 UTCEPSS rescore
  3. 2026-08-18 12:53 UTCGHSA enrichment
  4. 2026-08-18 08:59 UTCGHSA enrichment
  5. 2026-08-18 05:05 UTCGHSA enrichment
  6. 2026-08-18 01:11 UTCGHSA enrichment
  7. 2026-08-17 21:14 UTCGHSA enrichment
  8. 2026-08-17 17:21 UTCEG score recompute
  9. 2026-08-17 17:21 UTCGHSA enrichment
  10. 2026-08-17 13:47 UTCEPSS rescore
  11. 2026-08-17 13:26 UTCGHSA enrichment
  12. 2026-08-17 12:38 UTCGHSA enrichment
  13. 2026-08-17 10:41 UTCGHSA enrichment
  14. 2026-08-17 06:48 UTCGHSA enrichment
  15. 2026-08-17 02:56 UTCGHSA enrichment
  16. 2026-08-16 23:03 UTCGHSA enrichment
  17. 2026-08-16 19:10 UTCGHSA enrichment
  18. 2026-08-16 15:16 UTCEG score recompute
  19. 2026-08-16 15:16 UTCGHSA enrichment
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 11:23 UTCGHSA enrichment
  22. 2026-08-16 07:30 UTCGHSA enrichment
  23. 2026-08-16 03:38 UTCEG score recompute
  24. 2026-08-16 03:38 UTCGHSA enrichment
  25. 2026-08-15 23:45 UTCGHSA enrichment
  26. 2026-08-15 19:52 UTCGHSA enrichment
  27. 2026-08-15 15:59 UTCGHSA enrichment
  28. 2026-08-15 12:06 UTCGHSA enrichment
  29. 2026-08-15 08:13 UTCGHSA enrichment
  30. 2026-08-15 04:20 UTCGHSA enrichment
  31. 2026-08-15 04:14 UTCEG score recompute
  32. 2026-08-15 04:14 UTCGHSA enrichment
  33. 2026-08-15 02:24 UTCEG score recompute
  34. 2026-08-15 02:24 UTCGHSA enrichment
  35. 2026-08-15 01:30 UTCEPSS rescore
  36. 2026-08-14 22:32 UTCGHSA enrichment
  37. 2026-08-14 18:39 UTCGHSA enrichment
  38. 2026-08-14 17:36 UTCEG score recompute▲ 2.70
  39. 2026-08-14 17:36 UTCGHSA enrichment
  40. 2026-08-14 17:30 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  41. 2026-08-14 13:25 UTCGHSA enrichment
  42. 2026-08-14 01:23 UTCGHSA enrichment
  43. 2026-08-13 23:23 UTCEG score recompute
  44. 2026-08-13 23:23 UTCGHSA enrichment
  45. 2026-08-13 22:00 UTCEPSS rescore
  46. 2026-08-13 18:24 UTCGHSA enrichment
  47. 2026-08-13 06:22 UTCGHSA enrichment
  48. 2026-08-12 18:20 UTCEG score recompute
  49. 2026-08-12 18:20 UTCGHSA enrichment
  50. 2026-08-12 13:51 UTCEPSS rescore
  51. 2026-08-12 06:18 UTCGHSA enrichment
  52. 2026-08-11 18:15 UTCEG score recompute
  53. 2026-08-11 18:15 UTCGHSA enrichment
  54. 2026-08-11 05:59 UTCEG score recompute
  55. 2026-08-11 05:59 UTCGHSA enrichment
  56. 2026-08-11 00:00 UTCEPSS rescore
  57. 2026-08-10 17:57 UTCGHSA enrichment
  58. 2026-08-10 05:34 UTCGHSA enrichment
  59. 2026-08-09 17:32 UTCEG score recompute
  60. 2026-08-09 17:32 UTCGHSA enrichment
  61. 2026-08-09 13:47 UTCEPSS rescore
  62. 2026-08-09 05:31 UTCGHSA enrichment
  63. 2026-08-08 17:29 UTCEG score recompute
  64. 2026-08-08 17:29 UTCGHSA enrichment
  65. 2026-08-08 16:37 UTCEPSS rescore
  66. 2026-08-08 05:27 UTCGHSA enrichment
  67. 2026-08-07 17:25 UTCEG score recompute
  68. 2026-08-07 17:25 UTCGHSA enrichment
  69. 2026-08-07 13:46 UTCEG score recompute
  70. 2026-08-07 13:46 UTCGHSA enrichment
  71. 2026-08-07 02:17 UTCGHSA enrichment
  72. 2026-08-07 01:29 UTCEG score recompute▲ 7.10
  73. 2026-08-07 01:29 UTCGHSA enrichment
  74. 2026-08-07 01:28 UTCMITRE cvelistV5CVSS v3 → 7.1 · severity → HIGH
  75. 2026-08-06 22:19 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2026-65400?
CVE-2026-65400 is a critical vulnerability published on August 6, 2026. An authentication issue was addressed with improved state management. This issue is fixed in macOS Sequoia 15.7.9, macOS Sonoma 14.8.9, macOS Tahoe 26.6.1. An attacker on the network may be able to authenticate to Screen Sharing without valid credentials.
When was CVE-2026-65400 disclosed?
CVE-2026-65400 was first published in the National Vulnerability Database on August 6, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-65400 actively exploited?
Yes. CISA added CVE-2026-65400 to the Known Exploited Vulnerabilities catalog on August 18, 2026, affecting Apple macOS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-65400?
CVE-2026-65400 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
Which products are affected by CVE-2026-65400?
CVE-2026-65400 affects Apple macOS. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-65400?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-65400, 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-2026-65400

Explore →

Is Your Infrastructure Affected by CVE-2026-65400?

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

Start Free Scan →Browse All CVEs