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CVE-2026-33823 is an improper authorization vulnerability in the cloud-hosted Microsoft Teams Events Portal. The service failed to correctly validate whether an authenticated user was authorized to access requested event-related resources, allowing a low-privileged authenticated user to access data beyond their intended permissions over the network without user interaction. Available reporting indicates the flaw could expose sensitive event-related information across a tenant and may also permit unauthorized modification of related data. The issue affects the hosted Microsoft Teams backend service rather than a specific client build or on-premises component.
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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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An improper authorization vulnerability in Microsoft Teams that allows authorized information disclosure over a network.
An improper authorization vulnerability in Microsoft Teams that allows an authorized attacker to disclose information over a network.
An improper authorization vulnerability in the Microsoft Teams Events Portal that could allow low-privileged authenticated users to access and potentially modify sensitive event-related information across the service.
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.