An authentication issue was addressed with improved state management.
Apple's macOS versions before 14.8.9, 15.7.9, 26.6.1, 26.7 and 27 are affected, letting a network attacker authenticate to Screen Sharing without valid credentials. Fixed in macOS Tahoe 26.6.1.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Fix
- Fixed in 14.8.9, 15.7.9, 26.6.1, 26.7, 27
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: active
- Automatable: yes
- Technical impact: total
Summary
This vulnerability affects Apple's macOS operating system, specifically its Screen Sharing feature. An attacker on the network could potentially gain access to Screen Sharing without valid credentials, allowing unauthorized remote control of the affected Mac.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
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 attacker on the network may be able to authenticate to Screen Sharing without valid credentials.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: active · Automatable: yes · Technical impact: total
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
Affected versions
- Apple macOS
fixed in 14.8.9; fixed in 15.7.9; fixed in 26.6.1; fixed in 26.7; fixed in 27
References 5
support.apple.com
Questions about CVE-2026-65400
What does this mean?
An attacker on the network may be able to authenticate to Screen Sharing without valid credentials. The cause is an authentication issue that Apple fixed with improved state management.Source: support.apple.com
Am I affected, and how do I check?
All macOS builds listed in the fixed ranges are affected: anything before 14.8.9, 15.7.9, 26.6.1, 26.7 and 27. To check a Mac, run sw_vers -productVersion in Terminal or open Apple menu > About This Mac and compare the version number.Source: support.apple.com
What should I do about it?
Update macOS to the fixed release for its version line: 14.8.9, 15.7.9, 26.6.1, 26.7 or 27. Apple's advisory names macOS Tahoe 26.6.1 as the fix.Source: support.apple.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-08-18, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data