Security readout for executives and security teams
Plain-English summary
CVE-2026-20667 is an Apple sandbox escape issue. A malicious or compromised app may be able to break out of its normal restrictions and access more of the device or system than intended. Apple says improved checks fix the issue in listed iOS, iPadOS, macOS, and watchOS releases.
Executive priority
Prioritize routine-to-urgent patching for managed Apple fleets, especially endpoints handling sensitive data. This is high severity because sandbox escape can weaken core app isolation, but current provided sources do not confirm active exploitation.
Technical view
Apple describes this as a logic issue addressed with improved checks. The impact is sandbox escape by an app. CVSS 3.1 is 8.8 with local attack vector, low complexity, low privileges, no user interaction, changed scope, and high confidentiality, integrity, and availability impact. CWE mapping is CWE-693.
Likely exposure
Organizations are most exposed where Apple devices run versions earlier than iOS/iPadOS 26.3, macOS Sequoia 15.7.4, macOS Sonoma 14.8.4, macOS Tahoe 26.3, or watchOS 26.3. The bundle does not provide exact affected version ranges beyond the fixed releases.
Exploitation context
The issue requires local app execution with low privileges. Sources do not state active exploitation, and the CVE is not marked KEV in the provided bundle. Risk is higher on devices allowing untrusted apps, unmanaged software installation, or delayed Apple update deployment.
Researcher notes
Public details are limited. Apple identifies a logic issue and sandbox escape impact but does not name the component in the supplied description. Avoid assuming exploitability beyond local app context. Validate against Apple advisories and the CVE record as they may provide updated product-specific details.
Mitigation direction
- Update iOS and iPadOS devices to 26.3 or later per Apple guidance.
- Update macOS Sequoia to 15.7.4 or later where applicable.
- Update macOS Sonoma to 14.8.4 or later where applicable.
- Update macOS Tahoe to 26.3 or later where applicable.
- Update watchOS devices to 26.3 or later per Apple guidance.
- If updates are not immediately possible, review Apple guidance and restrict untrusted app installation.
Validation and detection
- Inventory Apple devices and record OS family and version.
- Compare installed versions against Apple’s fixed releases listed for this CVE.
- Confirm MDM compliance policies require the fixed versions or later.
- Review exception lists for devices unable to update promptly.
- Monitor Apple security update pages for revised affected-version details.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-693: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-20667 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H26Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://support.apple.com/en-us/126346CVE reference
- https://support.apple.com/en-us/126348CVE reference
- https://support.apple.com/en-us/126349CVE reference
- https://support.apple.com/en-us/126350CVE reference
- https://support.apple.com/en-us/126352CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Protection Mechanism Failure
Protection Mechanism Failure represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.