Microsoft Outlook up to 5.5 on iOS command injection

Summaryinfo

A vulnerability, which was classified as problematic, was found in Microsoft Outlook on iOS. Affected by this issue is some unknown functionality. Executing a manipulation can lead to command injection. This vulnerability is tracked as CVE-2026-42893. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Microsoft Outlook on iOS. This vulnerability affects some unknown functionality. The manipulation with an unknown input leads to a command injection vulnerability. The CWE definition for the vulnerability is CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. As an impact it is known to affect integrity.

The weakness was disclosed 05/12/2026 as confirmed security update guide (Website). The advisory is shared for download at msrc.microsoft.com. This vulnerability was named CVE-2026-42893. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 05/24/2026). The MITRE ATT&CK project declares the attack technique as T1202.

Upgrading to version 5.2617.1 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-29716). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Groupware Software

Vendor

• Microsoft

Name

• Outlook

Version

• -
• 4.0
• 4.01
• 4.5
• 4.27.3110
• 4.27.3110.1
• 4.72.2106
• 4.72.2106.4
• 4.72.3120.0
• 4.72.3612
• 4.72.3612.1700
• 5.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.01
• 5.1
• 5.5

License

• commercial

Website

• Vendor: https://www.microsoft.com/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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