MicrosoftCVE-2026-62911
Microsoft Exchange Server: authentication bypass
High8.0CVE-2026-62911 · Published Aug 11, 2026 · updated Sep 2, 2026
Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Microsoft Exchange Server 2016 Cumulative Update 23 Product | >= 15.01.0.0, < 15.01.2507.072 | 15.01.2507.072 |
| Microsoft Exchange Server 2019 Cumulative Update 14 Product | >= 15.02.0.0, < 15.02.1544.044 | 15.02.1544.044 |
| Microsoft Exchange Server 2019 Cumulative Update 15 Product | >= 15.02.0.0, < 15.02.1748.049 | 15.02.1748.049 |
| Microsoft Exchange Server Subscription Edition RTM Product | >= 15.02.0.0, < 15.02.2562.046 | 15.02.2562.046 |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-294
More Microsoft advisories
All Microsoft| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Aug 11 | Copilot Chat Security Feature Bypass Vulnerability | High7.1 | 1.132.1 |
| Aug 11 | Copilot Custom Agent Hook Remote Code Execution Vulnerability | High7.8 | 1.132.1 |
| Aug 11 | Information disclosure vulnerability | Medium | 1.132.1 |
| Aug 11 | Fileless RCE in VS Code Web Remote Terminal via URL-Controlled NODE_OPTIONS | High8.8 | 1.132.1 |
| Aug 11 | Visual Studio Code web deployments - environmentService.ts - RCE via NODE_OPTIONS --import from URL payload | High8.8 | 1.132.1 |
| Aug 11 | TerminalInstance._createProcess - Workspace Trust bypass via terminal waitOnExit | High7.8 | 1.132.1 |