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CVE-2026-41101 is a spoofing vulnerability in Microsoft Word for Android caused by improper access control in a shared Microsoft SDK used for Microsoft 365 Android single sign-on. According to the provided context, a production debug setting (setIsDebugMode(true)) was left enabled, which disabled the trust verification step intended to ensure that account-token requests originated only from trusted Microsoft applications. As a result, a malicious third-party Android application installed on the same device could request and obtain the signed-in user’s Microsoft account token from Word without a password prompt, login prompt, permission prompt, or other user interaction. The issue is described by researchers as part of the broader "FlagLeft" vulnerability family affecting multiple Microsoft 365 Android apps. For Word, Microsoft classified the issue as a local spoofing vulnerability with CVSS 3.1 vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N. The NVD context provided indicates Word for Android build 16.0.19822.20190 is patched and earlier versions are affected.
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A spoofing/improper access control vulnerability in Microsoft Word for Android caused by a debug flag left enabled in a shared SDK, allowing a malicious local app to request and receive the signed-in user's Microsoft account tokens.
An improper access control issue associated with the FlagLeft vulnerability affecting Microsoft Word for Android, enabling unauthorized token access via the shared SDK debug flag flaw.
A Microsoft Word for Android spoofing vulnerability caused by improper access control that allows an authorized attacker to perform spoofing locally.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.