High severity8.0NVD Advisory· Published Aug 11, 2026· Updated Sep 2, 2026
CVE-2026-62911
CVE-2026-62911
Description
Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
39cpe:2.3:a:microsoft:exchange_server:2016:-:*:*:*:*:*:*+ 37 more
- cpe:2.3:a:microsoft:exchange_server:2016:-:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_1:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_10:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_11:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_12:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_13:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_14:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_15:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_16:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_17:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_2:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_20:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_21:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_22:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_3:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_4:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_5:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_6:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_7:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_8:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_9:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:-:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_1:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_10:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_11:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_12:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_13:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_2:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_3:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_4:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_5:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_6:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_9:*:*:*:*:*:*
- (no CPE)
- cpe:2.3:a:microsoft:exchange_server_subscription_edition:*:*:*:*:*:*:*:*Range: <15.02.2562.046
Patches
Vulnerability mechanics
References
1- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62911nvdPatchVendor Advisory
News mentions
18- Weekly Cybersecurity Newsletter Bulletin – CrowdStrike Falcon, Chrome 0-Day, GPT-6 Astra, Dropbox Breach and 20+ StoriesCyber Security News · Sep 7, 2026
- Week in review: Claude accounts compromised through infostealer, Patch Tuesday forecastHelp Net Security · Sep 6, 2026
- In Other News: Microsoft’s Cloud Patches, Hacked Dropbox Accounts, Guardio’s $1.1B ValuationSecurityWeek · Sep 4, 2026
- September 2026 Patch Tuesday forecast: All we need is more timeHelp Net Security · Sep 4, 2026
- Nearly 22,000 Microsoft Exchange servers remain exposed to critical security flaw (CVE-2026-62911)Help Net Security · Sep 2, 2026
- 21,000+ Microsoft Exchange Servers Remain Exposed to Active CVE-2026-62911 ExploitationCyber Security News · Sep 1, 2026
- Public PoC Released for Microsoft Exchange Server Pre-auth RCE VulnerabilityCyber Security News · Sep 1, 2026
- Cyber Security Weekly Newsletter – Outlook RCE, Palo Alto, Cisco 0-day and Windows 0-Day Flaws +20 StoriesCyber Security News · Aug 16, 2026
- Microsoft Exchange Server Vulnerabilities Enable DoS, Privilege Escalation, and RCE AttacksCyber Security News · Aug 13, 2026
- Microsoft Patch Tuesday for August 2026 — Snort rules and prominent vulnerabilitiesCisco Talos Intelligence · Aug 11, 2026
- 421 bugs in Microsoft's Patch Tuesday release, and the Norks have already attacked oneThe Register Security · Aug 11, 2026
- Patch Tuesday - August 2026Rapid7 Blog · Aug 11, 2026
- August 2026 Patch Tuesday: Microsoft Fixes 421 CVEs, One Exploited Zero-DaySecurityWeek · Aug 11, 2026
- Microsoft Patch Tuesday Update August 2026 – 394 Vulnerabilities Fixed, Including 3 Zero-DaysCyber Security News · Aug 11, 2026
- ZDI-26-534: (Pwn2Own) Microsoft Exchange Capture-Replay Authentication Bypass VulnerabilityZero Day Initiative · Aug 11, 2026
- ZDI-26-535: (Pwn2Own) Microsoft Exchange External Control of File Path Remote Code Execution VulnerabilityZero Day Initiative · Aug 11, 2026
- ZDI-26-538: (Pwn2Own) Microsoft Exchange Improper Authorization Privilege Escalation VulnerabilityZero Day Initiative · Aug 11, 2026
- August 2026 Patch Tuesday: One Exploited Zero-Day and 62 Critical Vulnerabilities Among 415 CVEsCrowdStrike Blog