{"id":"CVE-2026-76497","kind":"vulnerability","aliases":["CVE-2026-76497"],"related":[],"title":"Cisco Expressway: insecure temporary files flaw from internal security review","description":"As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Expressway Series software engineering team has 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-2026-76497 are related to issues concerning insecure temporary files that are grouped under the Common Weakness Enumeration (CWE) Base CWE-377.","summary":"Cisco Expressway Series contains multiple internally found flaws tied to insecure temporary files (CWE-377), fixed in hardening releases. The sources do not say what an attacker gains beyond local file exposure or which releases are fixed.","severity":"medium","cvss":6.6,"epss":0.00116,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["cisco","expressway","self-hosted","vendor"],"not_affected_if":[],"how_to_check":null,"fix":"- Upgrade Cisco Expressway to the fixed release named in Cisco's advisory (version unknown from sources)","status":"open","published_at":"2026-10-21T17:19:09+00:00","first_seen_at":"2026-10-23T21:57:29+00:00","triaged_at":"2026-10-25T03:46:45+00:00","updated_at":"2026-10-25T03:46:45+00:00","category":"vendor","confidence":0.4,"triage":{"at":"2026-10-25T03:46:45Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Cisco Expressway to the fixed release named in Cisco's advisory (version unknown from sources)","reach":"local","title":"Cisco Expressway: insecure temporary files flaw from internal security review","impact":"medium","summary":"Cisco Expressway Series contains multiple internally found flaws tied to insecure temporary files (CWE-377), fixed in hardening releases. The sources do not say what an attacker gains beyond local file exposure or which releases are fixed.","category":"vendor","nicknames":[],"who_cares":["cisco","expressway","self-hosted"],"confidence":0.4,"needs_auth":"unknown","worst_case":"unknown; local insecure temporary files may expose data","analyst_note":"Find Cisco's advisory for CVE-2026-76497 to confirm affected and fixed Expressway versions and the exact attack conditions.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000535,"input_tokens":3418,"output_tokens":387,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A,105C '-377':37B,126C '-76497':13A,16A,106C 'address':95C 'attack':49B 'base':124C 'beyond':51B 'cisco':1A,17B,23B,63C,74C 'commit':66C 'common':120C 'comprehens':83C 'concern':111C 'conduct':81C 'contain':26B 'cve':11A,14A,104C 'cwe':36B,123C,125C 'discov':98C 'engin':78C 'enumer':122C 'exposur':54B 'expressway':2A,18B,24B,75C 'file':5A,35B,53B,114C 'fix':38B,59B 'flaw':6A,30B 'found':29B 'gain':50B 'group':117C 'harden':40B,92C 'host':21B 'insecur':3A,33B,112C 'intern':8A,28B,84C,97C 'issu':110C 'local':52B 'multipl':27B,96C 'ongo':65C 'part':61C 'proactiv':68C 'product':71C 'qualiti':72C 'relat':108C 'releas':41B,57B,93C 'result':89C 'review':10A,86C,88C 'say':46B 'secur':9A,69C,85C 'self':20B 'self-host':19B 'seri':25B,76C 'softwar':77C,91C 'sourc':43B 'team':79C 'temporari':4A,34B,113C 'tie':31B 'track':102C 'vendor':22B 'vulner':99C,101C 'weak':121C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-21T17:19:09+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H","cvss_by":"psirt@cisco.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-76497","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76497","severity":null,"published_at":"2026-10-21T17:19:09+00:00","modified_at":"2026-10-22T14:17:49+00:00","first_seen_at":"2026-10-23T21:57:29+00:00","fetched_at":"2026-10-23T22:29:01+00:00","note":null},{"source":"epss","external_id":"CVE-2026-76497","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-76497","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":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}