High severity · published Jun 9, 2026
CVE-2026-44822
Microsoft Excel Information Disclosure Vulnerability
8.2
CVSS
0.5%
EPSS
No
On KEV
Description
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OF
Office · Microsoft
All versions, or not specified · source: NVD
M3
Microsoft 365 Apps for Enterprise · Microsoft
16.0.1 before https://aka.ms/OfficeSecurityReleases · source: vendor
ME
Microsoft Excel 2016 · Microsoft
16.0.0.0 before 16.0.5556.1001 · source: vendor
MO
Microsoft Office 2019 · Microsoft
19.0.0 before https://aka.ms/OfficeSecurityReleases · source: vendor
MO
Microsoft Office 365 for Mac · Microsoft
1.0.0 before 16.110.26061317 · source: vendor
MO
Microsoft Office LTSC 2021 · Microsoft
16.0.1 before https://aka.ms/OfficeSecurityReleases · source: vendor
MO
Microsoft Office LTSC 2024 · Microsoft
16.0.0 before https://aka.ms/OfficeSecurityReleases · source: vendor
MO
Microsoft Office LTSC for Mac 2021 · Microsoft
16.0.1 before 16.110.26061317 · source: vendor
MO
Microsoft Office LTSC for Mac 2024 · Microsoft
16.0.0 before 16.110.26061317 · source: vendor
OO
Office Online Server · Microsoft
16.0.0.0 before 16.0.10417.20137 · source: vendor, NVD
EX
Excel · Microsoft
2016; 2016 · source: NVD
M3
Microsoft 365 · Microsoft
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44822
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44822
Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44822
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