OTX Threat: Major vulnerability found in ancient TACACS+ networking protocol

Australian security firm Elttam discovered a critical pre-authentication remote code execution vulnerability in TACACS+, a 33-year-old protocol handling authentication on networking equipment. The protocol, released by Cisco in 1993 and now baked into almost all modern networking devices, is widely used at large enterprises, ISPs, data centers, and cloud providers. Attackers can exploit the vulner CVEs: CVE-2026-48842, CVE-2026-42542, CVE-2026-87902 Sectors: Telecommunications