Critical severity · published Oct 13, 2026
CVE-2026-70096
Windows Rich Text Edit Control Remote Code Execution Vulnerability
9.8
CVSS
1.1%
EPSS
No
On KEV
Description
Heap-based buffer overflow in Windows Rich Text Edit Control allows an unauthorized attacker to execute code over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 65% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
M3
Microsoft 365 Apps for Enterprise · Microsoft
16.0.1 before https://aka.ms/OfficeSecurityReleases · source: vendor
MO
Microsoft Office 365 for Mac · Microsoft
1.0.0 before 16.114.26101123 · source: vendor
MO
Microsoft Office LTSC 2021 · Microsoft
16.0.1 before 16.0.14334.20974 · source: vendor
MO
Microsoft Office LTSC 2024 · Microsoft
16.0.0 before 16.0.17932.21056 · source: vendor
MO
Microsoft Office LTSC for Mac 2021 · Microsoft
16.0.1 before 16.114.26101123 · source: vendor
MO
Microsoft Office LTSC for Mac 2024 · Microsoft
16.0.0 before 16.114.26101123 · source: vendor
W1
Windows 10 Version 1607 · Microsoft
10.0.14393.0 before 10.0.14393.9612 · source: vendor
W1
Windows 10 Version 1809 · Microsoft
10.0.17763.0 before 10.0.17763.9376 · source: vendor
W1
Windows 10 Version 21H2 · Microsoft
10.0.19044.0 before 10.0.19044.7807 · source: vendor
W1
Windows 10 Version 22H2 · Microsoft
10.0.19045.0 before 10.0.19045.7807 · source: vendor
W1
Windows 11 Version 24H2 · Microsoft
10.0.26100.0 before 10.0.26100.9711 · source: vendor
W1
Windows 11 Version 25H2 · Microsoft
10.0.26200.0 before 10.0.26200.9711 · source: vendor
Affected product
M3
Microsoft 365 Apps for Enterprise
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-70096
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-70096
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70096
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