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PatchSiren cyber security CVE debrief

CVE-2026-20684 Apple CVE debrief

Apple addressed a permissions issue in macOS Tahoe 26.4 that could allow an app to bypass Gatekeeper checks. The available advisory data points to a low-severity issue with limited integrity impact, but it is still worth prioritizing on systems running macOS Tahoe 26.0 through 26.3 because Gatekeeper is part of the software trust chain.

Vendor
Apple
Product
Unknown
CVSS
LOW 3.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-03-25
Original CVE updated
2026-05-10
Advisory published
2026-03-25
Advisory updated
2026-05-10

Who should care

Administrators and users running macOS Tahoe 26.0 through 26.3, especially environments that rely on Gatekeeper to screen application launches and reduce exposure to untrusted software.

Technical summary

According to NVD’s modified record and the linked Apple advisory, CVE-2026-20684 is a permissions issue in macOS Tahoe that was fixed in macOS Tahoe 26.4. NVD maps the vulnerable range to macOS 26.0 through before 26.4 and assigns CVSS v3.1 vector AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N, indicating local conditions, required user interaction, and limited integrity impact.

Defensive priority

Low overall severity, but moderate priority for hosts on macOS Tahoe 26.0-26.3 because the issue affects a core trust-control path and is fixed in a specific maintenance release.

Recommended defensive actions

  • Update macOS Tahoe systems to 26.4 or later.
  • Prioritize assets still on macOS Tahoe 26.0-26.3 for remediation.
  • Continue standard software trust controls and avoid approving untrusted apps unless necessary.
  • Track Apple’s vendor advisory for any follow-up guidance or release note updates.

Evidence notes

The NVD modified record dated 2026-05-10 cites Apple support note 126794 and lists macOS vulnerable from 26.0 through before 26.4. The record includes CVSS v3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N and does not show a CISA KEV entry in the supplied corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-20684 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-20684

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-20684 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-20684

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.