DaystoPatch

AppleExploited incident

Apple macOS Improper Authentication Vulnerability

CVE-2026-65400Critical, CVSS 9.8In CISA's Known Exploited Vulnerabilities catalog since 18 Aug 2026

Automated timeline. Not yet checked by a researcher, so it doesn't count toward any grade.

FixedFixed for every supported version on the day it became public.

Response

Silence
same day
First public report to first vendor statementUnverified source
Exposure
same day
First public report to first fix
Follow-through
same day
First public report to a fix for every supported versionUnverified source
  • Vendor silent
  • Vendor statement, no fix
  • Fixed for some versions
  • Fixed when disclosed
  • Date only, no time of day

Timeline and evidence

Open a moment to see its source and archived quote.

  1. First public report

    CVE.org record CVE-2026-65400ClaimedQuote verified

    An authentication issue was addressed with improved state management. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.7.9, macOS Sonoma 14.8.9, macOS Tahoe 26.6.1, macOS Tahoe 26.7. An

    CVE record published.

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    sha256:193b67f7ed4f4090…
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    6 more sources for this moment
    Apple advisory 148170/CVE-2026-65400ClaimedQuote not found in archive6 Aug 2026

    macOS Tahoe 26.6.1: Screen Sharing. Impact: An attacker on the network may be able to authenticate to Screen Sharing without valid credentials Description: An authentication issue was addressed with

    The vendor's own disclosure.

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    Bluesky postClaimedQuote not checked yet6 Aug 2026, 19:12 UTC

    CVE-2026-65400

    Earliest third-party post we hold.

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    Bluesky post social
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    Research: huntressClaimedQuote verified7 Aug 2026

    From Screen Share to Root Access: Breaking Down CVE-2026-43760 and CVE-2026-65400 on macOS

    Earliest mention we hold (a vetted outlet).

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    Research: huntress research
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    Mastodon postClaimedQuote not checked yet7 Aug 2026, 09:12 UTC

    One oversized packet lets attackers skip Screen Sharing's login and land straight in a root shell. 9 detections, 10 IOCs. Full analysis + IOCs: https:// intel.threadlinqs.com/threat/T L-2026-1925 #

    Earliest third-party post we hold.

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    Hacker NewsClaimedQuote not checked yet10 Aug 2026, 18:16 UTC

    CVE-2026-65400: Apple macOS Screen Sharing authentication bypass

    Earliest third-party post we hold.

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    Hacker News hn
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    CISA KEV (CVE-2026-65400)ClaimedQuote verified18 Aug 2026

    Apple macOS Improper Authentication Vulnerability

    Added to CISA's KEV catalog on 2026-08-18.

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  2. Vendor statement

    date onlysame dayUnverified: quote not found in the archived copy

    Apple advisory 148170/CVE-2026-65400ClaimedQuote not found in archive

    macOS Tahoe 26.6.1: Screen Sharing. Impact: An attacker on the network may be able to authenticate to Screen Sharing without valid credentials Description: An authentication issue was addressed with

    Recorded time
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    sha256:a0dc8b1a76a54196…
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    4 more sources for this moment
    Apple advisory 148171/CVE-2026-65400ClaimedQuote verified6 Aug 2026

    Released August 6, 2026

    From the advisory's revision history.

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    Apple advisory 148172/CVE-2026-65400ClaimedQuote verified6 Aug 2026

    Released August 6, 2026

    From the advisory's revision history.

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    Apple advisory 149035/CVE-2026-65400ClaimedQuote verified14 Sep 2026

    Released September 14, 2026

    From the advisory's revision history.

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    Apple advisory 149042/CVE-2026-65400ClaimedQuote verified14 Sep 2026

    Released September 14, 2026

    From the advisory's revision history.

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  3. First workaround

    No official mitigation found yet.

  4. First fix

    date onlysame day

    Apple advisory 148170/CVE-2026-65400ClaimedQuote verified

    Released August 6, 2026

    fixed in macOS Tahoe 26.6.1; one candidate per OS branch

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    4 more sources for this moment
    Apple advisory 148171/CVE-2026-65400ClaimedQuote verified6 Aug 2026

    Released August 6, 2026

    fixed in macOS Sequoia 15.7.9; one candidate per OS branch

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    Apple advisory 148172/CVE-2026-65400ClaimedQuote verified6 Aug 2026

    Released August 6, 2026

    fixed in macOS Sonoma 14.8.9; one candidate per OS branch

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    Apple advisory 149035/CVE-2026-65400ClaimedQuote verified14 Sep 2026

    Released September 14, 2026

    fixed in macOS Golden Gate 27; one candidate per OS branch

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    Apple advisory 149042/CVE-2026-65400ClaimedQuote verified14 Sep 2026

    Released September 14, 2026

    fixed in macOS Tahoe 26.7; one candidate per OS branch

    Recorded time
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  5. Fixed for all versions

    date onlysame dayUnverified: derived by rule, not read from a source

    Apple advisory 148170/CVE-2026-65400Inferred

    macOS Tahoe 26.6.1: Screen Sharing. Impact: An attacker on the network may be able to authenticate to Screen Sharing without valid credentials Description: An authentication issue was addressed with

    Patch-day rule: Apple ships fixes in the advisory that discloses a bug, and this advisory states that fixed versions exist. So the vendor statement, first fix and fix for all versions all take the advisory's publication time.

    Recorded time
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    Inferred. Derived by a documented rule.
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    Not found in the archived copy. Treat with caution.
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    sha256:a0dc8b1a76a54196…
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    Yes
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Send this to your boss

No brief for this incident yet. We write one for every open incident and every critical bug exploited before a fix.

Affected products

  • macOS
  • macOS Golden Gate 27
  • macOS Tahoe 26.7
  • macOS Tahoe 26.6.1
  • macOS Sequoia 15.7.9
  • macOS Sonoma 14.8.9

Related

No related incidents.

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