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CVE-2026-65667 is a critical elevation of privilege vulnerability in Microsoft Teams caused by missing authorization. The flaw allows an unauthorized attacker to access functionality or resources without proper authorization checks and elevate privileges over the network. Available metadata indicates the issue is network-exploitable, requires no prior privileges and no user interaction, and affects the hosted Teams service. The associated CVSS v3.1 vector indicates changed scope with high confidentiality and integrity impact and no direct availability impact.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
A critical missing authorization vulnerability in Microsoft Teams that could lead to elevation of privilege over the network.
A missing authorization vulnerability in Microsoft Teams that allows an unauthorized attacker to elevate privileges over a network.
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.