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CVE-2026-62911 is an elevation-of-privilege vulnerability in Microsoft Exchange Server caused by an authentication bypass by capture-replay. The flaw affects supported on-premises Exchange Server releases including Exchange Server 2016, Exchange Server 2019, and Exchange Server Subscription Edition on x64 systems. Successful exploitation allows an authorized attacker to bypass normal authentication controls over the network and obtain elevated access within Exchange. Reporting indicates the issue can be leveraged to gain access to Exchange user mailboxes, and public discussion notes working exploit demonstrations at Pwn2Own Berlin.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Exchange authentication bypass vulnerability that allows access to users' mailboxes; exploit was demonstrated at Pwn2Own Berlin.
An elevation-of-privilege vulnerability affecting Microsoft Exchange Server.
A Microsoft Exchange privilege-escalation vulnerability via authentication bypass that could allow attackers to take over Exchange user mailboxes, send and read emails, and download attachments.
An elevation-of-privilege vulnerability in Microsoft Exchange Server.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.