{"id":"CVE-2026-117962","kind":"vulnerability","aliases":["CVE-2026-117962"],"related":[],"title":"Firefox: Quota Manager boundary flaw lets web content escape sandbox","description":"Sandbox escape due to incorrect boundary conditions in the Storage: Quota Manager component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6.","summary":"A boundary-condition error in Firefox's Storage Quota Manager component allows a sandbox escape. The sources do not say what an attacker gains beyond escaping the sandbox.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","desktop","firefox","runtime"],"not_affected_if":["fixed-version"],"how_to_check":"- Run `firefox --version` (or check About Firefox) and compare against `159` for Firefox or `153.6` for Firefox ESR.","fix":"- Update Firefox to `159` or later.\n- Update Firefox ESR to `153.6` or later.","status":"open","published_at":"2026-10-27T14:16:52+00:00","first_seen_at":"2026-10-27T14:32:24+00:00","triaged_at":"2026-10-27T14:35:27+00:00","updated_at":"2026-10-27T14:35:27+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-10-27T14:35:27Z","model":"claude-haiku-5-5","output":{"fix":"- Update Firefox to `159` or later.\n- Update Firefox ESR to `153.6` or later.","reach":"internet","title":"Firefox: Quota Manager boundary flaw lets web content escape sandbox","impact":"high","summary":"A boundary-condition error in Firefox's Storage Quota Manager component allows a sandbox escape. The sources do not say what an attacker gains beyond escaping the sandbox.","category":"runtime","nicknames":[],"who_cares":["firefox","desktop","browsers"],"confidence":0.5,"needs_auth":"unknown","worst_case":"Web content escapes the browser sandbox and reaches the host system.","analyst_note":"Check Mozilla's security advisory for the CVE to confirm the attack preconditions and the actual impact beyond sandbox escape.","how_to_check":"- Run `firefox --version` (or check About Firefox) and compare against `159` for Firefox or `153.6` for Firefox ESR.","needs_analyst":true,"not_affected_if":["fixed-version"],"who_is_affected":"Anyone running Firefox or Firefox ESR builds older than the fixed versions, including desktop installs on managed fleets. The sources do not say whether specific configurations or sites change exposure.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000564,"input_tokens":3268,"output_tokens":474,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-117962':13A,16A '-2026':12A,15A '153.6':73C '159':69C 'allow':33B 'attack':44B 'beyond':46B 'boundari':4A,23B,55C 'boundary-condit':22B 'browser':17B 'compon':32B,62C 'condit':24B,56C 'content':8A 'cve':11A,14A 'desktop':18B 'due':52C 'error':25B 'escap':9A,36B,47B,51C 'esr':72C 'firefox':1A,19B,27B,68C,71C 'fix':66C 'flaw':5A 'gain':45B 'incorrect':54C 'let':6A 'manag':3A,31B,61C 'quota':2A,30B,60C 'runtim':20B 'sandbox':10A,35B,49B,50C 'say':41B 'sourc':38B 'storag':29B,59C 'vulner':64C 'web':7A","nicknames":[],"mitigations":[],"who_affected":"Anyone running Firefox or Firefox ESR builds older than the fixed versions, including desktop installs on managed fleets. The sources do not say whether specific configurations or sites change exposure.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T14:16:52+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-117962","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117962","severity":null,"published_at":"2026-10-27T14:16:52+00:00","modified_at":"2026-10-27T14:16:52+00:00","first_seen_at":"2026-10-27T14:32:24+00:00","fetched_at":"2026-10-27T14:32:24+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"}