CVE-2026-45458 | Microsoft Outlook and Word Remote Code Execution Vulnerability

Access of resource using incompatible type ('type confusion') in Microsoft Office allows an unauthorized attacker to execute code locally.

Published: 2026-06-09 Last update: 2026-06-19 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-45458 is rated Moderate Risk (45.9/100): CVSS High severity, with low exploitation likelihood (EPSS 0.44%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-45458

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-23 0.35% 0.44% +0.09%
2 2026-06-15 0.06% 0.35% +0.29%
3 2026-06-10 — 0.06% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-45458

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.4 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.5 5.9 [email protected]

Weakness enumeration for CVE-2026-45458

GitHub Security Advisory for CVE-2026-45458

GHSA-5632-qjr7-ch9q · Severity: high — Access of resource using incompatible type ('type confusion') in Microsoft Office allows an...

Affected software / configurations for CVE-2026-45458

Vendor Product Version Raw CPE
microsoft office_365 >= 1.0.0, < 16.110.26061317 cpe:2.3:a:microsoft:office_365:*:*:*:*:*:macos:*:*
microsoft sharepoint_server_2016 >= 16.0.0, < 16.0.5556.1005 cpe:2.3:a:microsoft:sharepoint_server_2016:*:*:*:*:enterprise:*:*:*
microsoft sharepoint_server_2019 >= 16.0.0, < 16.0.10417.20153 cpe:2.3:a:microsoft:sharepoint_server_2019:*:*:*:*:*:*:*:*
microsoft office_2019 >= 19.0.0, < https://aka.ms/OfficeSecurityReleases cpe:2.3:a:microsoft:office_2019:*:*:*:*:*:*:*:*
microsoft 365_apps >= 16.0.1, < https://aka.ms/OfficeSecurityReleases cpe:2.3:a:microsoft:365_apps:*:*:*:*:enterprise:*:*:*
microsoft office_macos_2021 >= 16.0.1, < 16.110.26061317 cpe:2.3:a:microsoft:office_macos_2021:*:*:*:*:*:long_term_servicing_channel:*:*
microsoft office_2021 >= 16.0.1, < https://aka.ms/OfficeSecurityReleases cpe:2.3:a:microsoft:office_2021:*:*:*:*:long_term_servicing_channel:*:*:*
microsoft sharepoint_server >= 16.0.0, < 16.0.19725.20384 cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*
microsoft office_2024 >= 16.0.0, < https://aka.ms/OfficeSecurityReleases cpe:2.3:a:microsoft:office_2024:*:*:*:*:long_term_servicing_channel:*:*:*
microsoft office_macos_2024 >= 16.0.0, < 16.110.26061317 cpe:2.3:a:microsoft:office_macos_2024:*:*:*:*:*:long_term_servicing_channel:*:*
microsoft word_2016 >= 16.0.1, < 16.0.5556.1000 cpe:2.3:a:microsoft:word_2016:*:*:*:*:*:*:*:*

References for CVE-2026-45458

cvelogic Threat Intelligence