CVE-2026-45466
published 2026-06-09CVE-2026-45466: Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
PriorityP418low3.3CVSS 3.1
AVLACLPRNUIRSUCLINAN
EPSS
0.37%
29.5th percentile
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | microsoft_365_apps_for_enterprise | >= 16.0.1 < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| microsoft | microsoft_office_365_for_mac | >= 1.0.0 < 16.110.26061317 | 16.110.26061317 |
| microsoft | microsoft_office_ltsc_2021 | >= 16.0.1 < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| microsoft | microsoft_office_ltsc_2024 | >= 16.0.0 < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| microsoft | microsoft_office_ltsc_for_mac_2021 | >= 16.0.1 < 16.110.26061317 | 16.110.26061317 |
| microsoft | microsoft_office_ltsc_for_mac_2024 | >= 16.0.0 < 16.110.26061317 | 16.110.26061317 |
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VulDB
Microsoft Word up to LTSC 2024 heap-based overflow
vuldb·2026-06-21·CVSS 3.3
CVE-2026-45466 [LOW] Microsoft Word up to LTSC 2024 heap-based overflow
A vulnerability has been found in Microsoft Word 365/365 Apps/LTSC/LTSC 2021/LTSC 2024 and classified as problematic. The impacted element is an unknown function. This manipulation causes heap-based buffer overflow.
This vulnerability appears as CVE-2026-45466. The attack may be initiated remotely. There is no available exploit.
It is suggested to install a patch to address this issue.
GHSA
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
ghsa_unreviewed·2026-06-09
CVE-2026-45466 [LOW] CWE-122 Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
No detection rules found.
No public exploits indexed.
Sans Isc
Microsoft June 2026 Patch Tuesday, (Tue, Jun 9th)
blogs_sans_isc·2026-06-09·CVSS 8.8
CVE-2026-49160 [HIGH] Microsoft June 2026 Patch Tuesday, (Tue, Jun 9th)
Microsoft June 2026 Patch Tuesday
Published: 2026-06-09. Last Updated: 2026-06-09 17:34:29 UTC
by Johannes Ullrich (Version: 1)
0 comment(s)
Microsoft today released patches for 204 vulnerabilities. 38 of these vulnerabilities are considered critical, and three have been disclosed before today. Six of the vulnerabilities affect Microsoft cloud solutions and do not require any user action. In addition, Microsoft incorporated 360 different vulnerabilities affecting Chromium into its Edge browser.
This is certainly a busier-than-usual patch Tuesday. In particular, the large number of patched Chromium/Edge vulnerabilities underscores the impact of AI tools on vulnerability discovery.
Some noteworthy vulnerabilities:
CVE-2026-49160: This vulnerability was made public a week ago. As implem
Rapid7
Patch Tuesday - June 2026
blogs_rapid7·2026-06-09·CVSS 7.8
CVE-2026-33825 [HIGH] Patch Tuesday - June 2026
Microsoft is publishing 200 vulnerabilities on June 2026 Patch Tuesday . Microsoft is not aware of exploitation in the wild for any of these vulnerabilities, and is aware of public disclosure for three. This is similar to last month’s Patch Tuesday, however several of last month’s vulnerabilities ended up on CISA KEV in the days following their publication. So far this month, Microsoft has provided patches to address 360 browser vulnerabilities, which is an order of magnitude more than has been typical in any given month over the past few years. As usual, browser vulns are not included in the Patch Tuesday count above. Indeed, the vast, and presumably sustained, uptick in the number of browser vulnerabilities has led to Microsoft no longer enumerating Chromium CVEs in the Security Update G
Bleepingcomputer
Microsoft June 2026 Patch Tuesday fixes 3 zero-day, 200 flaws
blogs_bleepingcomputer·2026-06-09·CVSS 7.8
CVE-2026-45586 [HIGH] Microsoft June 2026 Patch Tuesday fixes 3 zero-day, 200 flaws
## Microsoft June 2026 Patch Tuesday fixes 3 zero-day, 200 flaws
## Lawrence Abrams
65 Elevation of Privilege Vulnerabilities
19 Security Feature Bypass Vulnerabilities
55 Remote Code Execution Vulnerabilities
30 Information Disclosure Vulnerabilities
7 Denial of Service Vulnerabilities
27 Spoofing Vulnerabilities
When BleepingComputer reports on Patch Tuesday security updates, we only count those released by Microsoft today.
Therefore, the number of flaws does not include flaws in Mariner, Azure HorizonDB, Microsoft Copilot, Copilot Chat, M365 Copilot, Microsoft Exchange Online, and Microsoft Graph that were fixed by Microsoft earlier this month.
There were also a massive 360 Microsoft Edge/Chromium flaws that were fixed by Google this month, which were excluded from this Patch
2026-06-09
Published