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8.0
HIGH CVSS 3.1
CVE-2026-62911
Microsoft Exchange Server Elevation of Privilege Vulnerability
Overview
Description

Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Details
INFO

Published Date :

Aug. 11, 2026, 5:18 p.m.

Last Modified :

Aug. 12, 2026, 5:19 a.m.

Remotely Exploit :

No

Source :

[email protected]
Impact
Affected Products

The following products are affected by CVE-2026-62911 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Microsoft exchange_server_se
2 Microsoft exchange_server_2019
3 Microsoft exchange_server_2016
: Total Affected Vendor : 1 | Products : 3
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.1 HIGH f38d906d-7342-40ea-92c1-6c4a2c6478c8
CVSS 3.1 HIGH [email protected]
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-62911.

URL Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62911
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-62911 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-62911 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-62911 vulnerability anywhere in the article.

  • security.nl
Microsoft Patchdinsdag: Misbruikt Windows-lek, kritieke updates Office en Exchange

Tijdens de patchdinsdag van augustus heeft Microsoft updates voor honderden kwetsbaarheden uitgebracht, waaronder voor een actief aangevallen Windows-lek, kritieke kwetsbaarheden in Microsoft Office d ... Read more

Published Date: Aug 12, 2026 (1 hour, 28 minutes ago)
  • CrowdStrike.com
August 2026 Patch Tuesday: One Exploited Zero-Day and 62 Critical Vulnerabilities Among 415 CVEs

Microsoft has addressed 415 vulnerabilities in its August 2026 security update release. This month's patches include fixes for one exploited zero-day vulnerability, three disclosed zero-day vulnerabil ... Read more

Published Date: Aug 12, 2026 (5 hours, 5 minutes ago)
  • TheCyberThrone
Microsoft Patch Tuesday August 2026

Microsoft’s August 2026 Patch Tuesday is another substantial  security release, addressing 421 vulnerabilities across Windows, Office, Azure, Exchange Server, SharePoint Server, developer tooling and ... Read more

Published Date: Aug 12, 2026 (9 hours, 13 minutes ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-62911 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Aug. 12, 2026

    Action Type Old Value New Value
    Added SSVC {'id': 'CVE-2026-62911', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-06T00:00:00+00:00'}
  • New CVE Received by [email protected]

    Aug. 11, 2026

    Action Type Old Value New Value
    Added Affected [{'vendor': 'Microsoft', 'product': 'Microsoft Exchange Server 2016 Cumulative Update 23', 'versions': [{'status': 'affected', 'version': '15.01.0.0', 'lessThan': '15.01.2507.072', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Exchange Server 2019 Cumulative Update 14', 'versions': [{'status': 'affected', 'version': '15.02.0.0', 'lessThan': '15.02.1544.044', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Exchange Server 2019 Cumulative Update 15', 'versions': [{'status': 'affected', 'version': '15.02.0.0', 'lessThan': '15.02.1748.049', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Exchange Server Subscription Edition RTM', 'versions': [{'status': 'affected', 'version': '15.02.0.0', 'lessThan': '15.02.2562.046', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}]
    Added Description Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
    Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
    Added CWE CWE-294
    Added Reference https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62911
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact