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CVE-2026-26123 is an information disclosure vulnerability in Microsoft Authenticator for Android and iOS. Based on the provided content, the issue stems from Microsoft Authenticator not properly claiming or exclusively handling the ms-msa:// deep link used during onboarding, sign-in, and QR-code-based 2FA setup flows. Because the scheme was not securely bound to the legitimate app, a malicious application installed on the same device could register itself as a handler for the ms-msa scheme and receive authentication data intended for Microsoft Authenticator. Reported intercepted data includes authentication tokens, one-time login codes, and special sign-in links embedded in the deep link. In the described attack flow, a victim scans a legitimate Microsoft QR code or taps a sign-in link, then the malicious app is selected to open the deep link, allowing it to extract the code parameter and exfiltrate it. The vulnerability is local to the device and depends on user interaction, but it can undermine MFA workflow integrity and enable unauthorized access to Microsoft accounts and related services.
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No public exploit code observed for this vulnerability.
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14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A deep link hijacking vulnerability in Microsoft Authenticator where the ms-msa:// authentication link was not properly claimed by the app, allowing a malicious app to intercept authentication tokens and cause full account takeover.
A vulnerability in Microsoft Authenticator on Android and iOS that could allow a malicious app on the same device to intercept authentication deep links, one-time login codes, or sign-in data intended for the authenticator app.
A Microsoft Authenticator (Android/iOS) vulnerability that can enable a man-in-the-middle sign-in interception via a malicious app handling sign-in deep links (requires user interaction/social engineering).
An information disclosure vulnerability in Microsoft Authenticator for iOS and Android that may affect MFA pipeline integrity, though technical details are not yet fully available.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.