365 Apps
CVE-2026-20953
HIGH
Use After Free (CWE-416)
2026-01-13
secure@microsoft.com
8.4
CVSS 3.1 · NVD
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Severity by source
NVD
PRIMARY
8.4
HIGH
AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
ENISA EUVD
HIGH
qualitative
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Lifecycle Timeline
2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 13, 2026 - 18:16 nvd
HIGH 8.4
DescriptionCVE.org
Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.
AnalysisAI
Use after free in Microsoft Office allows an unauthorized attacker to execute code locally. [CVSS 8.4 HIGH]
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- Risk assessment & exploitation conditions
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Access
Craft malicious Office document
Exploit
Open file in vulnerable Microsoft Office
Execution
Trigger use-after-free in memory management
Impact
Execute arbitrary code with user privileges
Access
Craft malicious Office document
Exploit
Open file in vulnerable Microsoft Office
Execution
Trigger use-after-free in memory management
Impact
Execute arbitrary code with user privileges
Vulnerability AssessmentAI
| Exploitation | Local file access required. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 8.4 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker without authentication could exploit this vulnerability to compromise the affected system. |
| Remediation | Monitor vendor advisories for a patch. Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 7 days: Identify all affected systems and apply vendor patches promptly. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
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External POC / Exploit Code
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POC code from unknown sources may be malicious, contain backdoors, or be fake.
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Verify the source reputation and cross-reference with known databases (Exploit-DB, GitHub Security).