CVE-2026-81391
Microsoft Excel Information Disclosure Vulnerability
Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Microsoft Excel Information Disclosure Vulnerability
Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
- Record
CVE-2026-81391- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C - Weakness
- CWE-908
- Updated
- 2026-11-02
EUVDEUVD-2026-73860
Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
- Record
EUVD-2026-73860- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-pg22-g362-3mr2
Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to...
Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
- Record
GHSA-pg22-g362-3mr2- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N - Weakness
- CWE-908
- Updated
- 2026-11-02
NVD
Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
- Record
CVE-2026-81391- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N - Weakness
- CWE-908
- Updated
- 2026-11-02
Affected products
- microsoft excel
- microsoft 365 apps
- microsoft 365 apps for enterprise
- microsoft excel 2016
- microsoft office 2016
- microsoft office 2019
- microsoft office 365 for mac
- microsoft office ltsc 2021
- microsoft office ltsc 2024
- microsoft office ltsc for mac 2021
- microsoft office ltsc for mac 2024
- microsoft 365
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History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-81391 is a medium vulnerability (CVSS 5.5) in Microsoft Excel, published September 8, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.54%, the 45th percentile. No source names a fixed version.