PT-2026-47945 · Microsoft · Outlook+3

CVE-2026-45458 · Published 2026-06-09 · Updated 2026-06-19

Positive Technologies (AI Summary)

CVSS v3.1

8.4

High

Base vector

AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Microsoft Office (affected versions not specified)

Description A type confusion issue occurs when a resource is accessed using an incompatible type. This allows an unauthorized attacker to execute code locally within Microsoft Outlook and Word.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

RCE

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2026-08109

CVE-2026-45458

Affected Products

Office

Office Word

Outlook

Sharepoint Server

References · 10

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-45458 · Security Note
• https://safe-surf.ru/specialists/bulletins-nkcki/733487 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-45458 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45458 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-08109 · Security Note
• https://twitter.com/threatcluster/status/2065437984967582066 · Twitter Post
• https://t.me/cveNotify/171211 · Telegram Post
• https://twitter.com/ThreatAft/status/2065648433894232462 · Twitter Post
• https://twitter.com/dailytechonx/status/2065498307460231495 · Twitter Post
• https://twitter.com/_patchpoint_/status/2064529036362301822 · Twitter Post