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CVE-2026-42832 is an improper access control vulnerability in Microsoft Office/Excel on Android. According to the provided context, the issue stemmed from a development/debug flag left enabled in production code within a shared Microsoft SDK used by multiple Microsoft 365 Android applications. That flag caused the normal trust verification during inter-application token handoff to be skipped, allowing an untrusted application on the same device to request and obtain the signed-in user’s Microsoft token as though it were a trusted Microsoft app. For Excel, Microsoft classified the issue as a local spoofing vulnerability under CWE-284 and assigned CVSS 7.7. The exposed tokens were described as Microsoft FOCI refresh tokens used for single sign-on across Microsoft applications, enabling access without a password, login prompt, or permission prompt.
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A spoofing/improper access control vulnerability in Microsoft Excel for Android caused by a debug flag left enabled in production, allowing a malicious app on the same device to retrieve Microsoft account tokens.
A Microsoft Office spoofing vulnerability caused by improper access control that allows an unauthorized 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.