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Cisco released an emergency patch for CVE-2026-20045, a critical zero-day vulnerability in Unified Communications Manager and related products that allows unauthenticated remote code execution. The flaw, already exploited in the wild, affects web management interfaces through improper HTTP request validation. CISA added it to the Known Exploited Vulnerabilities list, requiring immediate patching with no available workarounds. This follows another critical Cisco vulnerability patched days earlier.

Cisco plugs up Unified Comms zero-day under active exploit