CVE-2026-81958
MEDIUMCVSS 5.5/10
Last modified
CVE-2026-81958 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to disclose information locally..
Description
Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise | >= 16.0.1, < 16.0.20326.20138 |
| Microsoft | Microsoft Excel 2016 | >= 16.0.0.0, < 16.0.5569.1003 |
| Microsoft | Microsoft Office 2016 | >= 16.0.0, < 16.0.5569.1003 |
| Microsoft | Microsoft Office 2019 | >= 19.0.0, < 16.0.10417.20207 |
| Microsoft | Microsoft Office 365 for Mac | All versions |
| Microsoft | Microsoft Office LTSC 2021 | >= 16.0.1, < 16.0.14334.20906 |
| Microsoft | Microsoft Office LTSC 2024 | >= 16.0.0, < 16.0.17932.20976 |
| Microsoft | Microsoft Office LTSC for Mac 2021 | All versions |
| Microsoft | Microsoft Office LTSC for Mac 2024 | All versions |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
Frequently Asked Questions
What is CVE-2026-81958?
Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
How severe is CVE-2026-81958?
CVE-2026-81958 has a CVSS score of 5.5/10 (MEDIUM severity).
How do I fix CVE-2026-81958?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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Are you affected by CVE-2026-81958?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST