← Vulnerability feed

Vulnerability record · CVE-2026-63525 · published 11 August 2026

CVE-2026-63525: Microsoft 365 apps vulnerability

Microsoft · 365 Apps

Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to execute code locally.

7.8 CVSS 3.1 High EPSS 0.47% · top 62.1% CWE-197 · CWE-197
7.8CVSS 3.1 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
1References
13 Aug 2026Last modified by NVD

Description

Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to execute code locally.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63525 PatchVendor Advisory

Track CVE-2026-63525 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2024-21413Microsoft Outlook improper input validation remote code executionCVE-2024-21413 is a critical remote code execution flaw in Microsoft Outlook caused by improper input validation, tracked publicly as the MonikerLink…KEVEPSS 95%analysed9.8CVE-2023-23397Microsoft Outlook improper input validation privilege escalationCVE-2023-23397 is a critical elevation of privilege flaw in Microsoft Outlook caused by improper input validation and an authentication bypass by cap…KEVEPSS 97%analysed8.8CVE-2024-38189Microsoft Project Remote Code Execution via Improper Input ValidationMicrosoft Project and related Office products contain a remote code execution flaw rooted in improper input validation. An attacker can trigger code …KEVEPSS 8.2%analysed8.8CVE-2023-35311Microsoft Outlook security feature bypass via TOCTOU race conditionCVE-2023-35311 is a security feature bypass in Microsoft Outlook caused by a time-of-check time-of-use (TOCTOU) race condition (CWE-367). It affects …KEVEPSS 16%analysed8.8CVE-2018-0798Microsoft Office Equation Editor memory corruption RCEEquation Editor in Microsoft Office 2007 through 2016 mishandles objects in memory, producing an out-of-bounds write (CWE-787) that can be turned int…KEVEPSS 95%analysed8.8CVE-2015-2424Microsoft Office memory corruption via crafted documentCVE-2015-2424 is an out-of-bounds write (CWE-787) in Microsoft PowerPoint and Word that is triggered when a crafted Office document is opened. A remo…KEVEPSS 40%analysed8.8CVE-2007-0671Microsoft Excel remote code execution via malformed fileCVE-2007-0671 is an unspecified vulnerability in Microsoft Excel 2000, XP, 2003, and 2004 for Mac, and possibly other Office products, that allows re…KEVEPSS 43%analysed7.8CVE-2026-21514Microsoft Word security feature bypass via untrusted inputMicrosoft Word relies on untrusted inputs when making a security decision, allowing an attacker to bypass a security feature. The flaw affects Micros…KEVEPSS 1.5%analysed

Source: NIST National Vulnerability Database (record CVE-2026-63525), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.