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Microsoft Teams for iOS Sender Name Spoofing
CVE-2024-38197 is a spoofing vulnerability in Microsoft Teams for iOS that allows an attacker to alter the apparent sender name of a Teams message. The issue affects the integrity of identity presentation within the client, enabling messages or notifications to appear as though they originated from a trusted user rather than the actual sender. Available reporting associates the flaw with broader Teams impersonation and trust-boundary weaknesses that can be abused in collaboration workflows for deceptive communications and social engineering.
What it means and what to do now: patch path, interim mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
Successful exploitation can cause users to misattribute a message to a trusted colleague, executive, or other legitimate contact. This can facilitate social engineering, including persuading victims to disclose sensitive information, follow fraudulent instructions, or trust malicious communications. The primary impact is loss of message-origin authenticity and increased risk of downstream credential theft, fraud, or unauthorized information disclosure through impersonation.
If you can’t patch tonight, do this now.
Where immediate patch verification is not possible, reduce exposure by limiting trust in unsolicited Teams messages that request sensitive information or urgent action, especially when identity-sensitive workflows rely on display names alone. Use secondary verification for high-risk requests, enforce user awareness around impersonation in collaboration platforms, and apply mobile application management or enterprise update controls to ensure Teams for iOS clients receive current vendor fixes.
Patch, then assume compromise.
Apply the Microsoft security updates that address CVE-2024-38197 for Microsoft Teams for iOS. Available information indicates Microsoft rolled out fixes over time and completed remediation through vendor-managed updates. Organizations should ensure affected iOS clients are updated to the remediated release provided by Microsoft.
No public exploits tracked yet. Mallory keeps watching.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.