{"id":"CVE-2026-76474","kind":"vulnerability","aliases":["CVE-2026-76474"],"related":[],"title":"Cisco Unified CM and Unity Connection: improper authentication flaw, critical","description":"As part of Cisco's ongoing commitment to proactive security and product quality, engineering teams for Cisco Emergency Responder, Cisco Prime Collaboration Deployment, Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), and Cisco Unity Connection have conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.\r\n\r\nThe vulnerabilities tracked by CVE-2026-76474 are related to issues concerning improper authentication that are grouped under the Common Weakness Enumeration (CWE) Class CWE-287.","summary":"Cisco Unified Communications Manager, Unity Connection, IM&P and Emergency Responder have an authentication bypass (CWE-287) found in an internal review. The sources do not say exactly what an attacker can reach after bypassing the check, but the CVSS score is 9.8 and the flaw needs no account.","severity":"critical","cvss":9.8,"epss":0.00357,"exploited":false,"exploited_at":null,"products":[{"name":"Cisco Unified Communications Manager","fixed":["15SU5"],"affected":"14 (all SU), 15 through 15SU4a","ecosystem":"vendor"},{"name":"Cisco Unity Connection","fixed":["15SU5"],"affected":"14 (all SU), 15 through 15SU4","ecosystem":"vendor"},{"name":"Cisco Unified CM IM&P","fixed":["15SU5"],"affected":"14 (all SU), 15 through 15SU4","ecosystem":"vendor"},{"name":"Cisco Emergency Responder","fixed":["15SU5"],"affected":"14 (all SU), 15 through 15SU4","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["cisco","infrastructure","network","self-hosted","unauthenticated","unified-cm","unity-connection","voice"],"not_affected_if":["managed-hosting"],"how_to_check":"Check the installed release with the CUCM admin page or CLI command 'show version active' and compare it to the fixed release 15SU5.","fix":"Upgrade to 15SU5 (affected 15 through 15SU4 and all 14 SU releases per the advisory data); for 14, the sources give no fixed release.","status":"open","published_at":"2026-10-21T17:19:07+00:00","first_seen_at":"2026-10-23T21:57:29+00:00","triaged_at":"2026-10-23T22:33:07+00:00","updated_at":"2026-10-24T13:15:54+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T22:33:07Z","model":"claude-haiku-5-5","output":{"fix":"Upgrade to 15SU5 (affected 15 through 15SU4 and all 14 SU releases per the advisory data); for 14, the sources give no fixed release.","reach":"network","title":"Cisco Unified CM and Unity Connection: improper authentication flaw, critical","impact":"high","summary":"Cisco Unified Communications Manager, Unity Connection, IM&P and Emergency Responder have an authentication bypass (CWE-287) found in an internal review. The sources do not say exactly what an attacker can reach after bypassing the check, but the CVSS score is 9.8 and the flaw needs no account.","category":"infrastructure","who_cares":["cisco","unified-cm","unity-connection","voice","self-hosted"],"confidence":0.6,"needs_auth":"no","worst_case":"unauthenticated attacker bypasses login on Cisco voice servers","analyst_note":"Confirm the fixed release for affected version 14 and the exact auth-bypass behavior at https://nvd.nist.gov/vuln/detail/CVE-2026-76474 and Cisco's advisory.","how_to_check":"Check the installed release with the CUCM admin page or CLI command 'show version active' and compare it to the fixed release 15SU5.","needs_analyst":true,"not_affected_if":["managed-hosting"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000577,"input_tokens":3298,"output_tokens":495,"severity_before":"critical"},"analyst_status":"done","analyst_note":"Find the Cisco security advisory for CVE-2026-76474 to get affected and fixed versions, the specific vulnerable component, and whether the attack is remote and unauthenticated; the NVD entry in the sources gives only the CWE and CVSS 9.8.","search":"'-2026':12A,15A,174C '-287':62B,194C '-76474':13A,16A,175C '9.8':88B 'account':94B 'address':164C 'attack':76B 'authent':8A,59B,182C 'bypass':60B,80B 'check':82B 'cisco':1A,17A,21A,24A,29A,32B,46B,98C,111C,114C,118C,124C,135C,146C 'class':192C 'cm':3A,26A,41B,123C,132C,143C 'collabor':116C 'commit':101C 'common':188C 'communic':48B,120C,126C,137C 'communications':19A 'comprehens':152C 'concern':180C 'conduct':150C 'connect':6A,44B,51B,148C 'connection':23A 'critic':10A 'cve':11A,14A,173C 'cvss':85B 'cwe':61B,191C,193C 'deploy':117C 'discov':167C 'edit':141C 'emerg':55B,112C 'emergency':30A 'engin':108C 'enumer':190C 'exact':73B 'flaw':9A,91B 'found':63B 'group':185C 'harden':161C 'host':37B 'im':27A,52B,128C,133C 'improp':7A,181C 'infrastructur':33B 'intern':66B,153C,166C 'issu':179C 'manag':49B,121C,127C,138C,140C 'manager':20A 'multipl':165C 'need':92B 'network':34B 'ongo':100C 'p':28A,53B,134C 'part':96C 'presenc':129C 'prime':115C 'proactiv':103C 'product':106C 'qualiti':107C 'reach':78B 'relat':177C 'releas':162C 'respond':56B,113C 'responder':31A 'result':158C 'review':67B,155C,157C 'say':72B 'score':86B 'secur':104C,154C 'self':36B 'self-host':35B 'servic':130C 'session':139C 'sme':144C 'softwar':160C 'sourc':69B 'team':109C 'track':171C 'unauthent':38B 'unifi':2A,40B,47B,119C,122C,125C,131C,136C,142C 'unified':18A,25A 'unified-cm':39B 'uniti':5A,43B,50B,147C 'unity':22A 'unity-connect':42B 'voic':45B 'vulner':168C,170C 'weak':189C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-21T17:19:07+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_by":"psirt@cisco.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-76474","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76474","severity":null,"published_at":"2026-10-21T17:19:07+00:00","modified_at":"2026-10-22T23:19:07+00:00","first_seen_at":"2026-10-23T21:57:29+00:00","fetched_at":"2026-10-23T22:29:01+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-76474:233","url":null,"severity":null,"published_at":"2026-10-23T22:29:53+00:00","modified_at":"2026-10-23T22:29:53+00:00","first_seen_at":"2026-10-23T22:29:53+00:00","fetched_at":"2026-10-23T22:29:53+00:00","note":"Read Cisco advisory cisco-sa-voice-hardening-twgbH9e3 (via fetch summary): fixed 15SU5; 14 has no named fixed release; no workarounds; not known exploited. Affected list from OpenCVE. Sibling CVEs 76473,76475-76479,76481 are in the same advisory. Exact fixed 14 release and specific vulnerable component unknown; the advisory does not say."},{"source":"epss","external_id":"CVE-2026-76474","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-76474","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-24T13:15:54+00:00","fetched_at":"2026-10-24T13:15:54+00:00","note":null}],"documents":[{"id":1474,"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voice-hardening-twgbH9e3","title":"Cisco Unified Communications Products Security Hardening Release: October 2026","kind":"advisory","source":"analyst","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":null},{"id":1480,"url":"https://app.opencve.io/cve/CVE-2026-76474","title":"OpenCVE CVE-2026-76474 (affected version list)","kind":"other","source":"analyst","text":null,"published_at":null,"relation":"mentions","confidence":null,"note":null}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}