{"id":"CVE-2026-117862","kind":"vulnerability","aliases":["CVE-2026-117862"],"related":[],"title":"Firefox: networking boundary bug lets an attacker escalate privileges","description":"Privilege escalation due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6.","summary":"A boundary-condition error in Firefox's Networking component allows privilege escalation, according to the NVD description. The sources do not say what an attacker gains beyond the escalation or how it is triggered.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["desktop","firefox","managed-fleet","runtime"],"not_affected_if":["already-on-fixed-version"],"how_to_check":"- Run `firefox --version` (or check About Firefox) and compare against the fixed versions: Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6\n- unknown for other checks: the sources do not say","fix":"- Update Firefox to `159` or later\n- Update Firefox ESR to `115.44` or `153.6`, whichever matches your ESR branch","status":"open","published_at":"2026-10-27T14:16:40+00:00","first_seen_at":"2026-10-27T14:32:21+00:00","triaged_at":"2026-10-27T14:39:23+00:00","updated_at":"2026-10-27T14:39:23+00:00","category":"runtime","confidence":0.4,"triage":{"at":"2026-10-27T14:39:23Z","model":"claude-haiku-5-5","output":{"fix":"- Update Firefox to `159` or later\n- Update Firefox ESR to `115.44` or `153.6`, whichever matches your ESR branch","reach":"unknown","title":"Firefox: networking boundary bug lets an attacker escalate privileges","impact":"medium","summary":"A boundary-condition error in Firefox's Networking component allows privilege escalation, according to the NVD description. The sources do not say what an attacker gains beyond the escalation or how it is triggered.","category":"runtime","nicknames":[],"who_cares":["firefox","desktop","managed-fleet"],"confidence":0.4,"needs_auth":"unknown","worst_case":"unknown; sources say only privilege escalation","analyst_note":"Check Mozilla's security advisory for the Firefox 159 release for the exploit path, user interaction, and whether it is reachable from web content.","how_to_check":"- Run `firefox --version` (or check About Firefox) and compare against the fixed versions: Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6\n- unknown for other checks: the sources do not say","needs_analyst":true,"not_affected_if":["already-on-fixed-version"],"who_is_affected":"Teams that run Firefox or Firefox ESR on desktops or in managed fleets before the fixed versions. The sources do not say which configurations or platforms are exposed beyond that.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000588,"input_tokens":3266,"output_tokens":523,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-117862':12A,15A '-2026':11A,14A '115.44':77C '153.6':81C '159':74C 'accord':35B 'allow':32B 'attack':7A,47B 'beyond':49B 'boundari':3A,24B,62C 'boundary-condit':23B 'bug':4A 'compon':31B,67C 'condit':25B,63C 'cve':10A,13A 'descript':39B 'desktop':16B 'due':59C 'error':26B 'escal':8A,34B,51B,58C 'esr':76C,80C 'firefox':1A,17B,28B,73C,75C,79C 'fix':71C 'fleet':20B 'gain':48B 'incorrect':61C 'let':5A 'manag':19B 'managed-fleet':18B 'network':2A,30B,66C 'nvd':38B 'privileg':9A,33B,57C 'runtim':21B 'say':44B 'sourc':41B 'trigger':56B 'vulner':69C","nicknames":[],"mitigations":[],"who_affected":"Teams that run Firefox or Firefox ESR on desktops or in managed fleets before the fixed versions. The sources do not say which configurations or platforms are exposed beyond that.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T14:16:40+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-117862","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117862","severity":null,"published_at":"2026-10-27T14:16:40+00:00","modified_at":"2026-10-27T14:16:40+00:00","first_seen_at":"2026-10-27T14:32:21+00:00","fetched_at":"2026-10-27T14:32:21+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"}