CVE-2026-108449 — Microsoft Office Word Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- Technical severity (high)+6
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Microsoft Microsoft 365 Apps for Enterprise, Microsoft Microsoft Office 365 for Mac, Microsoft Microsoft Office LTSC 2021…).
- The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
- No fix documented in the sources: reduce exposure and monitor the vendor advisory.
- Exploitation requires user interaction: tighten email/web filtering and warn affected users.
- Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise | ≥ 16.0.1 and < https://aka.ms/OfficeSecurityReleases | Vulnerable | CVE Program (cve.org) e CISA ADP |
| Microsoft | Microsoft Office 365 for Mac | ≥ 1.0.0 and < 16.114.26101123 | Vulnerable | CVE Program (cve.org) e CISA ADP |
| Microsoft | Microsoft Office LTSC 2021 | ≥ 16.0.1 and < 16.0.14334.20974 | Vulnerable | CVE Program (cve.org) e CISA ADP |
| Microsoft | Microsoft Office LTSC 2024 | ≥ 16.0.0 and < 16.0.17932.21056 | Vulnerable | CVE Program (cve.org) e CISA ADP |
| Microsoft | Microsoft Office LTSC for Mac 2021 | ≥ 16.0.1 and < 16.114.26101123 | Vulnerable | CVE Program (cve.org) e CISA ADP |
| Microsoft | Microsoft Office LTSC for Mac 2024 | ≥ 16.0.0 and < 16.114.26101123 | Vulnerable | CVE Program (cve.org) e CISA ADP |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 8.8 | CVSS 3.1 | High | 2.8 | 5.9 | secure@microsoft.com via NIST National Vulnerability Database |
| 8.8 | CVSS 3.1 | High | — | — | GitHub, Inc. via GitHub Security Advisories |
| 8.8 | CVSS 3.1 | High | — | — | microsoft via CVE Program (cve.org) e CISA ADP |
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H (score shown at the top: secure@microsoft.com) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
- Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · microsoft/microsoft 365 apps for enterprise, microsoft/microsoft office 365 for mac, microsoft/microsoft office ltsc 202
- Record published
- CVSS changed · 8.8
- Source status changed · → Received
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 2× References added · Oct 15, 2026 – Oct 15, 2026
- 1× Official description updated · Oct 15, 2026 – Oct 15, 2026
References
3 on the record
Elsewhere on this site
Related CVEs (same products)
- Medium CVE-2026-108453 Microsoft Office PowerPoint Information Disclosure Vulnerability 2h
- Medium CVE-2026-108454 Microsoft Office PowerPoint Information Disclosure Vulnerability 2h
- Medium CVE-2026-108455 Microsoft Office PowerPoint Information Disclosure Vulnerability 2h
- High CVE-2026-108445 Microsoft Office Word Remote Code Execution Vulnerability 2h
- High CVE-2026-108447 Microsoft Office Word Remote Code Execution Vulnerability 2h
- High CVE-2026-108446 Microsoft Office Excel Remote Code Execution Vulnerability 2h
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No FIRST EPSS score.
- No fixed version, patch or mitigation documented.
- No CISA SSVC assessment.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2026-108449 is "Microsoft Office Word Remote Code Execution Vulnerability", rated High. It affects Microsoft 365 Apps for Enterprise (Microsoft); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 8.8 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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