CVE-2026-62911
Received Received - Intake

Authentication Bypass by Capture-Replay in Microsoft Exchange Server

Publication date: 2026-08-11

Last updated on: 2026-08-11

Assigner: Microsoft Corporation

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

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-08-11
Last Modified
2026-08-11
Generated
2026-08-11
AI Q&A
2026-08-11
EPSS Evaluated
N/A
NVD
CVE-2026-62911
EUVD
EUVD-2026-56688

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
microsoft exchange_server *

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-294 A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability is an authentication bypass by capture-replay in Microsoft Exchange Server. It allows an authorized attacker to elevate their privileges over a network by exploiting how authentication requests are handled.

Impact Analysis

An attacker could gain elevated access to your Exchange Server, potentially allowing them to read emails, modify data, or perform other unauthorized actions. This could lead to data breaches or further compromise of your systems.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating compliance requirements like GDPR or HIPAA. Organizations may face legal penalties, reputational damage, and loss of trust due to data exposure.

Mitigation Strategies

Apply the latest security updates from Microsoft for Exchange Server as soon as possible to patch the authentication bypass vulnerability.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-62911. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart