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CVE-2026-35435 is a critical elevation-of-privilege vulnerability in Azure AI Foundry M365 published agents caused by improper access control. The flaw affects the hosted service capability used to publish AI agents into Microsoft Teams and Microsoft 365 Copilot. Insufficient authorization enforcement in agent-related operations allows an unauthorized attacker to access functionality or resources beyond intended permission boundaries over the network. Microsoft classifies the issue as an exclusively hosted cloud-service vulnerability with changed scope and high confidentiality 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.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An improper access control vulnerability in Azure AI Foundry M365 published agents that allows unauthorized privilege escalation over a network.
A critical elevation of privilege vulnerability in Azure AI Foundry M365 published agents caused by improper access control, allowing an unauthorized attacker to elevate privileges over a network.
An improper access control vulnerability in Microsoft's Azure AI Foundry M365 published agents that allowed an unauthenticated network attacker to escalate privileges and breach confidentiality boundaries.
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.