Security readout for executives and security teams
Plain-English summary
CVE-2026-20677 is an Apple sandbox-bypass issue involving symbolic links and race conditions. Apple says a shortcut may bypass sandbox restrictions. Fixed releases are available for iOS, iPadOS, macOS, and visionOS. No provided source says it is being actively exploited.
Executive priority
Prioritize normal emergency patching for managed Apple fleets, especially executive, developer, and high-sensitivity devices. The issue is critical, but the sources do not show active exploitation.
Technical view
The issue is CWE-367, a time-of-check/time-of-use race condition, addressed by improved handling of symbolic links. CVSS 3.1 is 9.0 with network attack vector, high attack complexity, no privileges, no user interaction, changed scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Organizations with Apple devices running versions earlier than the fixed releases may be exposed. Apple lists fixes in iOS/iPadOS 18.7.5 and 26.3, macOS Sonoma 14.8.4, macOS Tahoe 26.3, and visionOS 26.3.
Exploitation context
The provided sources do not report active exploitation, and this CVE is not marked KEV in the bundle. The vulnerability class can be serious because sandbox bypasses may weaken app isolation, but public details are limited.
Researcher notes
Apple’s public description is sparse. The main confirmed facts are symbolic-link race handling, sandbox restriction bypass by a shortcut, affected Apple platforms, and fixed OS releases. Avoid assuming broader exploit chains without additional evidence.
Mitigation direction
- Update iOS and iPadOS to 18.7.5 or 26.3 where applicable.
- Update macOS Sonoma to 14.8.4 or macOS Tahoe to 26.3.
- Update visionOS devices to 26.3.
- Monitor Apple security advisories for any revised guidance or additional affected versions.
Validation and detection
- Inventory Apple endpoints by OS family and exact version.
- Confirm devices are on Apple-listed fixed versions or later.
- Review MDM compliance reports for unmanaged or update-deferred devices.
- Check Apple advisory pages for platform-specific applicability.
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-367: 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-2026-20677 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
- Critical
- CVSS
- 9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/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:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H2.26Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9CriticalVector: CVSS:3.1/AV:N/AC:H/PR:N/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/126347CVE reference
- https://support.apple.com/en-us/126348CVE reference
- https://support.apple.com/en-us/126350CVE reference
- https://support.apple.com/en-us/126353CVE 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.
Time-of-check Time-of-use (TOCTOU) Race Condition
Time-of-check Time-of-use (TOCTOU) Race Condition represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.