How severe is CVE-2026-55142?

CVE-2026-55142 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-55142 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-55142?

CVE-2026-55142 primarily affects Microsoft 365 Apps. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-55142?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-55142 published?

CVE-2026-55142 was published on 2026-07-14 and last updated on 2026-07-16.

CVE-2026-55142

CVE-2026-55142 is a medium-severity vulnerability in Microsoft 365 Apps with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-197.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-197
Affected product: Microsoft 365 Apps
Published: 2026-07-14
Last modified: 2026-07-16

Description

Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

Frequently asked questions

What is CVE-2026-55142?: Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
How severe is CVE-2026-55142?: CVE-2026-55142 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-55142 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-55142?: CVE-2026-55142 primarily affects Microsoft 365 Apps. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-55142?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-55142 published?: CVE-2026-55142 was published on 2026-07-14 and last updated on 2026-07-16.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55142

Affected products (14)

cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*
cpe:2.3:a:microsoft:microsoft_365:-:*:*:*:*:macos:*:*
cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x86:*
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*
cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*
cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*
cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x86:*

More vulnerabilities in Microsoft 365 Apps

CVE-2024-21413 — Critical (CVSS 9.8): Microsoft Outlook Remote Code Execution Vulnerability
CVE-2023-23397 — Critical (CVSS 9.8): Microsoft Outlook Elevation of Privilege Vulnerability
CVE-2020-0901 — Critical (CVSS 9.8): A remote code execution vulnerability exists in Microsoft Excel software when the software fails to properly handle…
CVE-2023-33150 — Critical (CVSS 9.6): Microsoft Office Security Feature Bypass Vulnerability
CVE-2026-70329 — High (CVSS 8.8): Integer overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code over a…
CVE-2026-65807 — High (CVSS 8.8): Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker…

All CVEs affecting Microsoft 365 Apps →

Other CWE-197 vulnerabilities

CVE-2024-43639 — Critical (CVSS 9.8): Windows KDC Proxy Remote Code Execution Vulnerability
CVE-2020-15202 — Critical (CVSS 9.0): In Tensorflow before versions 1.15.4, 2.0.3, 2.1.2, 2.2.1 and 2.3.1, the `Shard` API in TensorFlow expects the last…
CVE-2024-49018 — High (CVSS 8.8): SQL Server Native Client Remote Code Execution Vulnerability
CVE-2024-43519 — High (CVSS 8.8): Microsoft WDAC OLE DB provider for SQL Server Remote Code Execution Vulnerability
CVE-2024-30009 — High (CVSS 8.8): Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
CVE-2023-32143 — High (CVSS 8.8): D-Link DAP-1360 webupg UPGCGI_CheckAuth Numeric Truncation Remote Code Execution Vulnerability. This vulnerability…

Browse all CWE-197 vulnerabilities →