Live › vulnerability › CVE-2023-23397
Go to dashboardMicrosoft Office Outlook has a privilege escalation flaw that lets an attacker relay NTLM authentication to another service as the user. CISA lists it as actively exploited in the wild.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 3h before NVD. All times on this page are UTC.
Apply updates per vendor instructions.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Microsoft Office | vendor | – | – |
| microsoft 365 apps | vendor | – | – |
| microsoft office | vendor | = 2019 | – |
| microsoft office long term servicing channel | vendor | = 2021 | – |
| microsoft outlook | vendor | = 2013 | – |
| microsoft outlook | vendor | = 2016 | – |
Unknown from the sources.
Apply the Microsoft Office updates per vendor instructions, as CISA requires.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Microsoft Office Outlook contains a privilege escalation vulnerability that allows for a NTLM Relay attack against another service to authenticate as the user.
CISA required action: Apply updates per vendor instructions.
This page as .md · .json · in your agent: get_signal("CVE-2023-23397")
CISA KEV catalog, Creative Commons 0 · NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.