Microsoft Outlook for iOS Tampering Vulnerability

published 2026-05-12 5 mo ago modified 2026-10-26 13 d ago also EUVD-2026-29716

cvss: 7.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits: 0; none known

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to perform tampering over a network.

Patch / fix

fixed in 1 links 1

Microsoft Microsoft Outlook for iOS 5.2617.1

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42893 advisory

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 5 mo ago (2026-05-13)

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.4	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N/E:U/RL:O/RC:C
CNA	3.1	7.4	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

Microsoft Microsoft Outlook for iOS

Classification

Weakness

CWE-77 Improper Neutralization of Special Elements used in a Command

References

msrc.microsoft.com /update-guide/vulnerability/CVE-2026-42893
vendor-advisory, patch

Sources

CVE List CVE-2026-42893
NVD CVE-2026-42893

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary