EUVD-2026-77859
GHSA-x8pj-fh97-jf4v
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
A locally-installed app must run to reach the flaw, so AV:L/PR:L; the authorization bypass yields read access to sensitive data (C:H) with no integrity or availability impact.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
6DescriptionNVD
A permissions issue was addressed with improved validation. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. An app may be able to access sensitive user data.
AnalysisAI
Authorization bypass in Apple macOS allows a malicious or compromised application already running on the system to access sensitive user data it should not be able to reach. All macOS releases below Golden Gate 27, Tahoe 26.7, and Sequoia 15.8 are affected; the flaw is rooted in missing authorization checks (CWE-862) that Apple addressed through improved permission validation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a malicious or compromised application to already be running locally on an affected macOS version (below Golden Gate 27, 26.7, or 15.8); there is no remote or network delivery path despite the AV:N rating. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a classic Apple 'improved validation' authorization flaw (CWE-862) where an app can access sensitive user data it should not. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patches are available: macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7 address the missing authorization check, and administrators should update to or beyond those builds via Software Update, an MDM software-update policy, or the corresponding Apple security response, following the advisories at https://support.apple.com/en-us/149035, https://support.apple.com/en-us/149042, and https://support.apple.com/en-us/149043. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, confirm which Macs are running releases below Golden Gate 27, Tahoe 26.7, and Sequoia 15.8 by querying your endpoint management or MDM inventory, and flag any device that hosts regulated or executive data for priority handling; remind users not to approve installation or permission prompts for unrecognized applications, since a malicious app must already be running for this flaw to be reachable. …
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Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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