Report · SecurityWeekAbout CVE-2026-124194Published 10 Nov 2026

Exploited Outlook Zero-Day Among 1,094 Flaws Patched by Microsoft

Source SecurityWeek

Authoritative record:CVE-2026-124194· Medium 6.5

Not known to be exploited · CVSS 6.5 Medium · fixed in 16.0.14334.21048 : update Microsoft 365 Apps for Enterprise when convenient.

Data as of 10 Nov 2026, 19:33 UTC

CVSS 3.1 base score

6.5Medium

How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none

CVSS scores by source
CNA (microsoft)	CVSS 3.1	6.5

Patch: Available – fixed in 16.0.14334.21048, 16.0.17932.21140

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

Base metrics

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Temporal metrics

Exploit Code Maturity: Unproven
Remediation Level: Official Fix
Report Confidence: Confirmed

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.
Exploit Code Maturity: Unproven: No exploit code is available, or an exploit is theoretical.
Remediation Level: Official Fix: A complete vendor solution is available. Either the vendor has issued an official patch, or an upgrade is available.
Report Confidence: Confirmed: Detailed reports exist, or functional reproduction is possible (functional exploits may provide this). Source code is available to independently verify the assertions of the research, or the author or vendor of the affected code has confirmed the presence of the vulnerability.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 10 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

zero-day

What to do

Upgrade Microsoft Office LTSC to 16.0.14334.21048 (2021) or 16.0.17932.21140 (2024).

Affected software

Product	Affected	Fixed in
MicrosoftMicrosoft 365 Apps for Enterprise	Affected =16.0.1	Fixed in–
MicrosoftMicrosoft Office LTSC 2021	Affected >=16.0.1 <16.0.14334.21048	Fixed in 16.0.14334.21048
MicrosoftMicrosoft Office LTSC 2024	Affected >=16.0.0 <16.0.17932.21140	Fixed in 16.0.17932.21140

AI-suggested

Microsoft has released an official patch for this vulnerability as part of the November 2026 Patch Tuesday updates. Users and administrators should apply these updates promptly to mitigate the risk. Since the vulnerability requires user interaction, educating users to avoid opening suspicious files is also advisable. No additional mitigations are specified by Microsoft.

Description

CVE-2026-124194 is a zero-day vulnerability in Microsoft Outlook that has been actively exploited. It is a spoofing flaw where Outlook fails to alert users before connecting to an attacker-controlled network location when opening a malicious file. This can disclose the user's NTLMv2 hash, allowing an attacker to impersonate the user. The vulnerability requires user interaction to open a specially crafted message file and cannot be triggered via the Preview Pane. Microsoft has assigned it a moderate severity with a CVSS score of 6.5 and has released a patch as part of the November 2026 Patch Tuesday updates.

Impact

Successful exploitation can lead to disclosure of the user's NTLMv2 hash, enabling an attacker to impersonate the user by authenticating with the captured credentials. This can result in unauthorized access to resources and potential further compromise of the user's environment. The attack requires user interaction to open a malicious file and does not trigger from the Preview Pane, limiting the attack vector to some extent.

References

securityweek.com/exploited-outlook-zero-day-among-1094-flaws-patched-by-microsoft/ (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 10 Nov 2026, 19:33 UTC

Technical details

References

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