Security readout for executives and security teams
Plain-English summary
CVE-2026-20647 is an Apple macOS privacy issue where an app may access sensitive user data. Apple says it was fixed with improved data protection in macOS Tahoe 26.3. The risk is mainly confidentiality loss on affected Macs, not system takeover or service disruption.
Executive priority
Treat as a routine but important privacy update. Prioritize Macs used by executives, legal, finance, HR, developers, and other users handling sensitive information. There is no source-backed evidence of active exploitation.
Technical view
The CVSS 3.1 score is 5.5: local attack vector, low complexity, no privileges required, user interaction required, unchanged scope, high confidentiality impact, no integrity or availability impact. The CVE is categorized as CWE-200, exposure of sensitive information.
Likely exposure
Exposure likely applies to macOS Tahoe systems that have not been updated to 26.3, based on Apple’s advisory. The provided data does not identify other macOS branches, specific components, or exact sensitive data categories.
Exploitation context
No active exploitation is reported in the provided sources, and this CVE is not listed as KEV in the supplied bundle. Exploitation requires local app execution and user interaction, so risk increases where users install or run untrusted apps.
Researcher notes
Public detail is limited. Apple describes the issue only as improved data protection and potential sensitive user data access by an app. No vulnerable component, attack path, or proof-of-concept information is provided in the supplied sources.
Mitigation direction
- Update eligible Macs to macOS Tahoe 26.3 or later.
- Review Apple advisory HT126348 for any revised guidance.
- Prioritize managed endpoints handling sensitive user or business data.
Validation and detection
- Inventory macOS Tahoe devices and current OS versions.
- Confirm macOS Tahoe 26.3 is installed where applicable.
- Check Apple’s advisory for scope changes or follow-up updates.
- Review endpoint software inventory for untrusted or unnecessary apps.
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-200: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. 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-2026-20647 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.
Exposure of Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.