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Exploited Medium 6.5

Microsoft Outlookの脆弱性で認証情報漏えい、悪用確認

CVE-2026-124194 First seen on SecPulse

Summary

Microsoft Outlookで細工されたメッセージファイルを開くと、NTLMv2ハッシュが攻撃者に渡る脆弱性で、悪用が確認されています。Microsoft 365 AppsやOffice LTSCを使う組織は、修正版への更新と、不審なファイルを開いた人がいないかの確認を進めてください。

AI summary

Produced by SecPulse using an external AI model; it may contain mistakes. Check the original description and references below before acting on it.

Microsoft Outlookで細工されたメッセージファイルを開くと、NTLMv2ハッシュが攻撃者に渡る脆弱性で、悪用が確認されています。Microsoft 365 AppsやOffice LTSCを使う組織は、修正版への更新と、不審なファイルを開いた人がいないかの確認を進めてください。

Affected packages

PackageAffected → Fixed
MicrosoftMicrosoft 365 Apps for Enterprise
≥ 16.0.1, < https://aka.ms/OfficeSecurityReleases→ https://aka.ms/OfficeSecurityReleases
MicrosoftMicrosoft Office LTSC 2021
≥ 16.0.1, < 16.0.14334.21048→ 16.0.14334.21048
MicrosoftMicrosoft Office LTSC 2024
≥ 16.0.0, < 16.0.17932.21140→ 16.0.17932.21140
Original description The description as published by the source.

Product ui does not warn user of unsafe actions in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

Source: Microsoft Security Response Center Blog NVD GitHub Advisory CISA KEV

References

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