Security readout for executives and security teams
Plain-English summary
A flaw in listed Microsoft Word products could let an unauthorized attacker run code on an affected computer. Successful exploitation could expose data, alter files, or disrupt operations. The CVSS score is 8.4, making prompt remediation appropriate for organizations using the identified versions.
Executive priority
Treat as a high-priority patching issue, especially where Word endpoints hold sensitive information or privileged access. The potential impact is broad, but the supplied evidence does not support declaring an emergency caused by active exploitation.
Technical view
CVE-2026-20944 is a CWE-125 out-of-bounds read in Microsoft Office Word. The supplied CVSS 3.1 vector indicates local access, low complexity, no privileges, no user interaction, and potentially high confidentiality, integrity, and availability impact. The sources do not explain the precise exploitation path.
Likely exposure
Exposure is limited by the supplied evidence to Microsoft 365 Apps for Enterprise 16.0.1, Office LTSC for Mac 2021 16.0.1, and Office LTSC for Mac 2024 16.0.0. Confirm actual affected builds against Microsoft’s advisory because the bundle provides no broader version ranges.
Exploitation context
The bundle marks this CVE as absent from KEV and provides no evidence of active exploitation or a public exploit. That does not prove exploitation is impossible. The local CVSS attack vector suggests an attacker must first obtain execution context on, or access to, the affected system.
Researcher notes
The record attributes code execution to an out-of-bounds read but provides no root-cause detail, affected component, trigger format, or exploitation chain. Avoid assuming document delivery or user interaction because the CVSS vector states UI:N. Consult Microsoft’s advisory for authoritative build and remediation details.
Mitigation direction
- Review Microsoft’s CVE advisory for the applicable product and update instructions.
- Deploy the vendor-provided patch to confirmed affected installations promptly.
- Prioritize systems handling sensitive documents or used by privileged personnel.
- Use normal change controls and Microsoft-supported update channels.
Validation and detection
- Inventory installed Word products and versions against the three listed affected entries.
- Confirm patched builds match Microsoft’s current advisory guidance.
- Verify updates completed successfully across managed Windows and Mac endpoints.
- Re-scan endpoints and investigate installations that remain on affected builds.
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-125: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-20944 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
- 8.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
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.
SSVC decision data
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:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C2.55.9microsoftVulnerability scoring details
Base CVSS 3.1 score
8.4HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Microsoft Word Remote Code Execution VulnerabilityCVE reference, microsoft · vendor-advisory, patch
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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.