Security-feature bypass via undisclosed access-control flaw
Published Jan 13, 2026 · Updated Jan 13, 2026
Improper access control in Microsoft Office Excel allows local users to bypass a security feature after interacting with crafted content. Microsoft has not disclosed the affected Excel component or the incorrect operation it performs on untrusted input. User interaction is required, and the vendor has not identified the bypassed control or the specific actions available afterward.
Summary
What happened
Improper access control in Microsoft Office Excel allows local users to bypass a security feature after interacting with crafted content. Microsoft has not disclosed the affected Excel component or the incorrect operation it performs on untrusted input. User interaction is required, and the vendor has not identified the bypassed control or the specific actions available afterward.
The record
- CVE
- CVE-2026-20949
- Published
- Jan 13, 2026
- Updated
- Jan 13, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office LTSC for Mac 2024
- Classifications
- CWE-284
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 13, 2026CVE publishedPublication date reported by the CVE source.
- Jan 13, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=16.0.0 <16.105.26011018
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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