HIGH: Cisco Unified Communications Manager SSRF Flaw Has a Public PoC and a Root-Level Punchline (CVE-2026-20230)
Cisco's June 3 advisory for CVE-2026-20230 details a critical-rated SSRF in the Unified Communications Manager WebDialer service, with a CVSS 8.6 base score and a public proof-of-concept already in circulation. An unauthenticated attacker on the network can write arbitrary files to the underlying OS and chain that into root. Cisco has released fixes in 14SU6 and an interim COP for the 15 line, with 15SU5 due in September 2026. Disabling WebDialer is the recommended interim mitigation.