CVE-2026-62918 — Microsoft TEAMS
HIGHCVE-2026-62918 is a high-severity (CVSS 7.5) CWE-347 vulnerability in microsoft teams. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.
Improper verification of cryptographic signature in Microsoft Teams allows an unauthorized attacker to perform spoofing over a network.
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-62918.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Description
Improper verification of cryptographic signature in Microsoft Teams allows an unauthorized attacker to perform spoofing over a network.
Affected Products
teamsmicrosoftDetection & mitigation playbook
Vendor / applianceDetect
Inventory every microsoft teams deployment and check each version against the affected-products list above.
Remediation status
The records we use list no fixed version for CVE-2026-62918. Check the microsoft teams advisory for a patched release, and apply the workarounds below until you can upgrade.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Frequently Asked Questions
Is CVE-2026-62918 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.