CVE-2026-42893 Microsoft Outlook for iOS Tampering Vulnerability
An attacker can perform tampering via command injection in Microsoft Outlook for iOS, requiring a patch to mitigate the risk.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-42893?
CVE-2026-42893 is a high-severity command injection vulnerability in Microsoft Outlook, published on 12 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to perform tampering over a network.
Weakness: CWE-77
Which versions are affected by CVE-2026-42893?
It affects 1 product.
Products include Microsoft Outlook.
How do I fix CVE-2026-42893?
No fix has been published for CVE-2026-42893 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-42893 being exploited?
There is no known exploitation of CVE-2026-42893 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Outlook
Sources
Also known as GHSA-h35m-vhjw-vqxj.