Improper Authorization Information Disclosure in Microsoft Teams Events Portal
CVE-2026-33823 is a Microsoft Teams Events Portal vulnerability caused by improper authorization. According to Microsoft, the flaw allows an authorized attacker with low privileges to exploit the service over the network, without user interaction, and disclose information. The associated CVSS v3.1 vector is AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N, indicating low-complexity remote exploitation, low privileges required, no user interaction, changed scope, high confidentiality impact, high integrity impact, and no availability impact. The issue affects Microsoft’s hosted service environment rather than customer-managed software deployments.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
7 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.
The version that knows your environment.
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.