MSRC_CVE-2026-20943
Vulnerability from csaf_microsoft - Published: 2026-01-13 08:00 - Updated: 2026-01-13 08:00Summary
Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
Notes
Additional Resources
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer
The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
Customer Action
Required. The vulnerability documented by this CVE requires customer action to resolve.
{
"document": {
"acknowledgments": [
{
"names": [
"Kazuma Matsumoto, Security Researcher at GMO Cybersecurity by IERAE, Inc."
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"category": "legal_disclaimer",
"text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
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"title": "Microsoft Office Click-To-Run Elevation of Privilege Vulnerability",
"tracking": {
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"vulnerabilities": [
{
"cve": "CVE-2026-20943",
"cwe": {
"id": "CWE-426",
"name": "Untrusted Search Path"
},
"notes": [
{
"category": "general",
"text": "Microsoft",
"title": "Assigning CNA"
},
{
"category": "faq",
"text": "Successful exploitation of this vulnerability requires an attacker to prepare the target environment to improve exploit reliability.",
"title": "According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?"
},
{
"category": "faq",
"text": "An attacker who successfully exploited this vulnerability could gain ADMINISTRATOR privileges.",
"title": "What privileges could be gained by an attacker who successfully exploited this vulnerability?"
},
{
"category": "faq",
"text": "Customers should download the latest Office Deployment Tool (ODT) and ensure that this version, or any newer version, is used for all future deployments to remain protected against CVE-2026-20943.",
"title": "Are there additional steps I need to take to be protected from this vulnerability?"
},
{
"category": "faq",
"text": "A user would need to be tricked into opening a folder that contains a specially crafted file.",
"title": "According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?"
},
{
"category": "faq",
"text": "No, the Preview Pane is not an attack vector.",
"title": "Is the Preview Pane an attack vector for this vulnerability?"
}
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},
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"scores": [
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"environmentalsScore": 0.0,
"exploitCodeMaturity": "UNPROVEN",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"remediationLevel": "OFFICIAL_FIX",
"reportConfidence": "CONFIRMED",
"scope": "UNCHANGED",
"temporalScore": 6.1,
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
"version": "3.1"
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"threats": [
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"category": "impact",
"details": "Remote Code Execution"
},
{
"category": "exploit_status",
"details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
}
],
"title": "Microsoft Office Click-To-Run Elevation of Privilege Vulnerability"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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