CVE-2026-26123

Local sign-in data disclosure via URL-scheme hijacking

Published Mar 10, 2026 · Updated Mar 10, 2026

Improper authorization in Microsoft Authenticator before 6.2511.7533 on Android and 6.8.40 on iOS allows local users to read sign-in data. The custom URL-scheme handler does not restrict which installed app can receive an authentication deep link, allowing a malicious app to intercept the link and its sign-in data. Exploitation requires a malicious app on the same device and user interaction in selecting it as the link handler; confidentiality is affected, not data integrity or service availability.

CVSS severity5.5
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Microsoft Authenticator before 6.2511.7533 on Android and 6.8.40 on iOS allows local users to read sign-in data. The custom URL-scheme handler does not restrict which installed app can receive an authentication deep link, allowing a malicious app to intercept the link and its sign-in data. Exploitation requires a malicious app on the same device and user interaction in selecting it as the link handler; confidentiality is affected, not data integrity or service availability.

The record

CVE
CVE-2026-26123
Published
Mar 10, 2026
Updated
Mar 10, 2026
Vendor
Microsoft
Product
Microsoft Authenticator
Classifications
CWE-939
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.0.0 <6.2511.7533
  2. Affected versionversion=6.0.0 <6.8.40

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Authenticatorversion=6.0.0 <6.2511.7533; version=6.0.0 <6.8.40

Published CVSS scores

5.5Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-939Improper Authorization in Handler for Custom URL Scheme

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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