{"id":"CVE-2026-124874","kind":"vulnerability","aliases":["CVE-2026-124874"],"related":[],"title":"Firefox: Networking HTTP flaw lets pages bypass same-origin protection","description":"Same-origin policy bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.","summary":"A flaw in Firefox's Networking HTTP component lets a web page bypass the same-origin policy, which normally keeps one site from reading data belonging to another. The sources do not say what data an attacker can reach or how reliably.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Firefox","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["browser","firefox","vendor"],"not_affected_if":["already-updated-firefox"],"how_to_check":"- Check the Firefox version in Help > About Firefox; the sources do not give a single command.\n- Compare against `160`, `115.45` (ESR) and `153.7` (ESR), the versions named as fixed.","fix":"- Firefox `160`\n- Firefox ESR `115.45`\n- Firefox ESR `153.7`","status":"open","published_at":"2026-11-10T14:17:20+00:00","first_seen_at":"2026-11-10T14:22:14+00:00","triaged_at":"2026-11-10T14:26:20+00:00","updated_at":"2026-11-10T14:26:20+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-11-10T14:26:20Z","model":"claude-haiku-5-5","output":{"fix":"- Firefox `160`\n- Firefox ESR `115.45`\n- Firefox ESR `153.7`","reach":"internet","title":"Firefox: Networking HTTP flaw lets pages bypass same-origin protection","impact":"medium","summary":"A flaw in Firefox's Networking HTTP component lets a web page bypass the same-origin policy, which normally keeps one site from reading data belonging to another. The sources do not say what data an attacker can reach or how reliably.","audience":"everyone","category":"vendor","nicknames":[],"who_cares":["firefox","browser"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"A malicious website reads data from another site the user is logged into.","analyst_note":"Confirm exploitation conditions and the affected version ranges for Firefox and ESR from the Mozilla security advisory linked from NVD.","how_to_check":"- Check the Firefox version in Help > About Firefox; the sources do not give a single command.\n- Compare against `160`, `115.45` (ESR) and `153.7` (ESR), the versions named as fixed.","plain_action":"Update Firefox to version 160, or to ESR 115.45 or 153.7 if you use the extended support release.","product_name":"Firefox","needs_analyst":true,"not_affected_if":["already-updated-firefox"],"who_is_affected":"Anyone running a Firefox release older than the fixed versions named in the advisory. The sources do not say which specific browsing conditions trigger the bypass, so unknown whether any setting limits exposure.","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000748,"input_tokens":4494,"output_tokens":598,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-124874':14A,17A '-2026':13A,16A '115.45':84C '153.7':88C '160':81C 'anoth':50B 'attack':59B 'belong':48B 'browser':19B 'bypass':7A,34B,69C 'compon':29B,74C 'cve':12A,15A 'data':47B,57B 'esr':83C,87C 'firefox':1A,18A,20B,25B,80C,82C,86C 'fix':78C 'flaw':4A,23B 'http':3A,28B,73C 'keep':42B 'let':5A,30B 'network':2A,27B,72C 'normal':41B 'one':43B 'origin':10A,38B,67C 'page':6A,33B 'polici':39B,68C 'protect':11A 'reach':61B 'read':46B 'reliabl':64B 'same-origin':8A,36B,65C 'say':55B 'site':44B 'sourc':52B 'vendor':21B 'vulner':76C 'web':32B","nicknames":[],"mitigations":[],"who_affected":"Anyone running a Firefox release older than the fixed versions named in the advisory. The sources do not say which specific browsing conditions trigger the bypass, so unknown whether any setting limits exposure.","tier":"C","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 extended support release.","pkeys":["firefox"],"ptokens":["firefox"],"labels":["browser","firefox","unknown","vendor"],"campaign_type":null,"search_a":"'-124874':14A,17A '-2026':13A,16A 'bypass':7A 'cve':12A,15A 'firefox':1A,18A 'flaw':4A 'http':3A 'let':5A 'network':2A 'origin':10A 'page':6A 'protect':11A 'same-origin':8A","search_b":"'anoth':50B 'attack':59B 'belong':48B 'browser':19B 'bypass':34B 'compon':29B 'data':47B,57B 'firefox':20B,25B 'flaw':23B 'http':28B 'keep':42B 'let':30B 'network':27B 'normal':41B 'one':43B 'origin':38B 'page':33B 'polici':39B 'reach':61B 'read':46B 'reliabl':64B 'same-origin':36B 'say':55B 'site':44B 'sourc':52B 'vendor':21B 'web':32B","search_c":"'115.45':84C '153.7':88C '160':81C 'bypass':69C 'compon':74C 'esr':83C,87C 'firefox':80C,82C,86C 'fix':78C 'http':73C 'network':72C 'origin':67C 'polici':68C 'same-origin':65C 'vulner':76C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T14:17:20+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-124874","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124874","severity":null,"published_at":"2026-11-10T14:17:20+00:00","modified_at":"2026-11-10T14:17:20+00:00","first_seen_at":"2026-11-10T14:22:14+00:00","fetched_at":"2026-11-10T14:22:14+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"}