CVE-2026-44822
HighUpdated
Published: 09 June 2026
Published
09 June 2026
Modified
19 June 2026
KEV Added
—
Patch
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CVSS Score v3.1
8.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
EPSS Score
0.0052
40.2th percentile
Summary
CVE-2026-44822 is a high-severity Out-of-bounds Read (CWE-125) vulnerability in Microsoft Office 2021. Its CVSS base score is 8.2 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Data from Local System (T1005); ranked at the 40.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-35537
Vulnerability details
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
T1005 Data from Local System Collection
Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.
Why these techniques?
OOB read enables direct local data disclosure from victim system over network.
Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0
Affected Assets
microsoft
365 apps
all versions
microsoft
excel
2016
microsoft
microsoft 365
all versions
microsoft
office 2019
all versions
microsoft
office 2021
all versions
microsoft
office 2024
all versions
microsoft
office online server
all versions
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.