🛡️ CVE-2026-42893 — outlook

🟠 CVSS 7.4 — High ✅ No Known Exploit CWE-77 NVD
7.4
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality none, integrity high, availability none.

Weakness class

CVE-2026-42893 is classified as CWE-77: Command Injection. User input is placed into a command that the system interprets, allowing extra commands to be appended to the intended one.

Affected software

CVE-2026-42893 is recorded against 2 packages.

  • outlook (fixed in 5.2617.1)
  • unknown

Timeline and source

Published on 12 May 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

msrc.microsoft.com

Details

Severity HIGH
CVSS Score 7.4
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N
CWE CWE-77
Public Exploit ✅ No
Source NVD
Published 2026-05-12
Updated 2026-08-11
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
outlook — 5.2617.1
unknown — —

Similar Threats

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