{"id":"CVE-2026-124859","kind":"vulnerability","aliases":["CVE-2026-124859"],"related":[],"title":"Firefox: Storage Cache API flaw lets web content escape sandbox","description":"Sandbox escape due to incorrect boundary conditions in the Storage: Cache API component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.","summary":"A boundary-check error in the Storage Cache API of Firefox allows a sandbox escape. An attacker who gets content running in the browser may be able to break out of the sandbox that normally contains it.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Firefox","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["browser","firefox","linux","macos","other","windows"],"not_affected_if":["fixed-version"],"how_to_check":"- Check the Firefox version in Help > About Firefox, or run `firefox --version` on the machine\n- Compare against fixed versions `160`, `115.45` (ESR) and `153.7` (ESR)","fix":"- Firefox `160`\n- Firefox ESR `115.45`\n- Firefox ESR `153.7`","status":"open","published_at":"2026-11-10T14:17:18+00:00","first_seen_at":"2026-11-10T14:22:13+00:00","triaged_at":"2026-11-10T14:26:38+00:00","updated_at":"2026-11-10T14:26:38+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-11-10T14:26:38Z","model":"claude-haiku-5-5","output":{"fix":"- Firefox `160`\n- Firefox ESR `115.45`\n- Firefox ESR `153.7`","reach":"internet","title":"Firefox: Storage Cache API flaw lets web content escape sandbox","impact":"high","summary":"A boundary-check error in the Storage Cache API of Firefox allows a sandbox escape. An attacker who gets content running in the browser may be able to break out of the sandbox that normally contains it.","audience":"everyone","category":"other","nicknames":[],"who_cares":["firefox","browser","windows","macos","linux"],"confidence":0.6,"fix_status":"available","needs_auth":"unknown","worst_case":"Attacker escapes browser sandbox into the underlying system","analyst_note":"Confirm the affected version ranges and exploitation conditions from Mozilla's security advisory; NVD entry alone gives no CVSS or detail.","how_to_check":"- Check the Firefox version in Help > About Firefox, or run `firefox --version` on the machine\n- Compare against fixed versions `160`, `115.45` (ESR) and `153.7` (ESR)","plain_action":"Update Firefox to version 160, or to ESR 115.45 or 153.7 if you use the ESR channel.","product_name":"Firefox","needs_analyst":true,"not_affected_if":["fixed-version"],"who_is_affected":"Anyone running a Firefox release or ESR build older than the fixed versions. The sources do not say whether specific configurations are exposed, so unknown beyond the version check.","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000742,"input_tokens":4512,"output_tokens":582,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-124859':13A,16A '-2026':12A,15A '115.45':83C '153.7':87C '160':80C 'abl':51B 'allow':36B 'api':4A,33B,72C 'attack':41B 'boundari':26B,66C 'boundary-check':25B 'break':53B 'browser':18B,48B 'cach':3A,32B,71C 'check':27B 'compon':73C 'condit':67C 'contain':60B 'content':8A,44B 'cve':11A,14A 'due':63C 'error':28B 'escap':9A,39B,62C 'esr':82C,86C 'firefox':1A,17A,19B,35B,79C,81C,85C 'fix':77C 'flaw':5A 'get':43B 'incorrect':65C 'let':6A 'linux':20B 'maco':21B 'may':49B 'normal':59B 'run':45B 'sandbox':10A,38B,57B,61C 'storag':2A,31B,70C 'vulner':75C 'web':7A 'window':23B","nicknames":[],"mitigations":[],"who_affected":"Anyone running a Firefox release or ESR build older than the fixed versions. The sources do not say whether specific configurations are exposed, so unknown beyond the version check.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Firefox to version 160, or to ESR 115.45 or 153.7 if you use the ESR channel.","pkeys":["firefox"],"ptokens":["firefox"],"labels":["browser","firefox","high","linux","macos","other","vendor","windows"],"campaign_type":null,"search_a":"'-124859':13A,16A '-2026':12A,15A 'api':4A 'cach':3A 'content':8A 'cve':11A,14A 'escap':9A 'firefox':1A,17A 'flaw':5A 'let':6A 'sandbox':10A 'storag':2A 'web':7A","search_b":"'abl':51B 'allow':36B 'api':33B 'attack':41B 'boundari':26B 'boundary-check':25B 'break':53B 'browser':18B,48B 'cach':32B 'check':27B 'contain':60B 'content':44B 'error':28B 'escap':39B 'firefox':19B,35B 'get':43B 'linux':20B 'maco':21B 'may':49B 'normal':59B 'run':45B 'sandbox':38B,57B 'storag':31B 'window':23B","search_c":"'115.45':83C '153.7':87C '160':80C 'api':72C 'boundari':66C 'cach':71C 'compon':73C 'condit':67C 'due':63C 'escap':62C 'esr':82C,86C 'firefox':79C,81C,85C 'fix':77C 'incorrect':65C 'sandbox':61C 'storag':70C 'vulner':75C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T14:17:18+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-124859","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124859","severity":null,"published_at":"2026-11-10T14:17:18+00:00","modified_at":"2026-11-10T14:17:18+00:00","first_seen_at":"2026-11-10T14:22:13+00:00","fetched_at":"2026-11-10T14:22:13+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}