Security readout for executives and security teams
Plain-English summary
CVE-2026-20629 is an Apple macOS privacy flaw involving temporary file handling. A local app may access user-sensitive data. Apple says the issue is fixed in macOS Tahoe 26.3. The business risk is confidentiality exposure on Macs that have not received the relevant update.
Executive priority
Treat as a routine but important confidentiality patch. It is not documented as actively exploited, but it can expose sensitive user data on unpatched Macs. Prioritize managed fleet updates, especially for high-sensitivity users.
Technical view
Apple describes this as CWE-922, insecure storage of sensitive information, addressed by improved handling of temporary files. CVSS 3.1 is 5.5: local attack vector, low complexity, no privileges, user interaction required, high confidentiality impact, no integrity or availability impact.
Likely exposure
Exposure is limited to macOS systems affected by this Apple advisory and not updated to macOS Tahoe 26.3 or later. The source bundle does not identify specific earlier macOS build ranges beyond the fixed release.
Exploitation context
No CISA KEV listing is provided, and the supplied sources do not report active exploitation. The CVSS vector indicates exploitation is local and requires user interaction, with the main impact being unauthorized access to sensitive user data.
Researcher notes
Public details are sparse. Apple attributes the fix to improved temporary file handling and classifies impact as sensitive data access by an app. Avoid assuming cross-version impact or exploitability beyond the CVSS and advisory language.
Mitigation direction
- Update affected Macs to macOS Tahoe 26.3 or later where applicable.
- Review Apple’s advisory for any environment-specific guidance.
- Prioritize systems used by executives, developers, and users handling sensitive data.
Validation and detection
- Inventory macOS devices and identify Tahoe versions below 26.3.
- Confirm security update deployment through MDM or endpoint management tooling.
- Review Apple advisory records for CVE-2026-20629 coverage.
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-922: 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-2026-20629 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
- Medium
- CVSS
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
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:N/UI:R/S:U/C:H/I:N/A:N1.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://support.apple.com/en-us/126348CVE 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.
Insecure Storage of Sensitive Information
Insecure Storage of Sensitive Information represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.