Affects widely used collaboration tool; enables data disclosure across orgs, high risk to confidentiality.
CVE-2026-33823
Critical Teams auth flaw may disclose data over network.
Is CVE-2026-33823 being exploited?
Not confirmed. CVE-2026-33823 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.72% probability of exploitation in the next 30 days.
How severe is CVE-2026-33823?
CVE-2026-33823 is rated Critical with a CVSS score of 9.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-33823?
Yes. A fix has been recorded for CVE-2026-33823. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-33823 affect?
CVE-2026-33823 affects Microsoft Teams. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-33823?
Patch when available; review access controls; monitor for leakage.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker with valid access can disclose sensitive Teams information over the network due to improper authorization.
Patch when possible