{"id":"CVE-2026-124902","kind":"vulnerability","aliases":["CVE-2026-124902"],"related":[],"title":"Firefox: race condition in Audio/Video lets pages bypass same-origin policy","description":"Same-origin policy bypass due to race condition in the Audio/Video component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.","summary":"A race condition in Firefox's Audio/Video component lets a page bypass the same-origin policy, which keeps websites from reading data from other sites. The fix is in Firefox 160, Firefox ESR 115.45 and Firefox ESR 153.7.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Firefox","fixed":[],"affected":"","ecosystem":"runtime"}],"ecosystems":["runtime"],"tags":["browsers","firefox","runtime"],"not_affected_if":["already-updated"],"how_to_check":"- Check the installed Firefox version in the About Firefox dialog or with `firefox --version`\n- Exposed if the version is below `160` on the current branch, below `115.45` on ESR 115, or below `153.7` on ESR 153","fix":"- Firefox `160`\n- Firefox ESR `115.45`\n- Firefox ESR `153.7`","status":"open","published_at":"2026-11-10T14:17:23+00:00","first_seen_at":"2026-11-10T14:22:16+00:00","triaged_at":"2026-11-10T14:24:49+00:00","updated_at":"2026-11-10T14:24:49+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-11-10T14:24:49Z","model":"claude-haiku-5-5","output":{"fix":"- Firefox `160`\n- Firefox ESR `115.45`\n- Firefox ESR `153.7`","reach":"internet","title":"Firefox: race condition in Audio/Video lets pages bypass same-origin policy","impact":"medium","summary":"A race condition in Firefox's Audio/Video component lets a page bypass the same-origin policy, which keeps websites from reading data from other sites. The fix is in Firefox 160, Firefox ESR 115.45 and Firefox ESR 153.7.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["firefox","browsers"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"A malicious web page reads data from other websites the user is signed into.","analyst_note":"","how_to_check":"- Check the installed Firefox version in the About Firefox dialog or with `firefox --version`\n- Exposed if the version is below `160` on the current branch, below `115.45` on ESR 115, or below `153.7` on ESR 153","plain_action":"Update Firefox to version 160, or to the latest ESR release (115.45 or 153.7), to close this security hole.","product_name":"Firefox","needs_analyst":false,"not_affected_if":["already-updated"],"who_is_affected":"Anyone running a Firefox version older than the fixed releases on a desktop or mobile device. Systems that only use other browsers or sealed managed builds with the fix applied are not affected.","user_interaction":"yes","product_ecosystem":"runtime","needs_special_setup":"no","severity_if_unknown":"unknown"},"cost_usd":0.000732,"input_tokens":4500,"output_tokens":563,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-124902':15A,18A '-2026':14A,17A '115.45':57B,84C '153.7':61B,88C '160':54B,81C 'audio/video':5A,29B,73C 'browser':20B 'bypass':8A,34B,66C 'compon':30B,74C 'condit':3A,25B,70C 'cve':13A,16A 'data':45B 'due':67C 'esr':56B,60B,83C,87C 'firefox':1A,19A,21B,27B,53B,55B,59B,80C,82C,86C 'fix':50B,78C 'keep':41B 'let':6A,31B 'origin':11A,38B,64C 'page':7A,33B 'polici':12A,39B,65C 'race':2A,24B,69C 'read':44B 'runtim':22B 'same-origin':9A,36B,62C 'site':48B 'vulner':76C 'websit':42B","nicknames":[],"mitigations":[],"who_affected":"Anyone running a Firefox version older than the fixed releases on a desktop or mobile device. Systems that only use other browsers or sealed managed builds with the fix applied are not affected.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":null,"pkeys":["firefox"],"ptokens":["firefox"],"labels":["browsers","firefox","runtime","unknown"],"campaign_type":null,"search_a":"'-124902':15A,18A '-2026':14A,17A 'audio/video':5A 'bypass':8A 'condit':3A 'cve':13A,16A 'firefox':1A,19A 'let':6A 'origin':11A 'page':7A 'polici':12A 'race':2A 'same-origin':9A","search_b":"'115.45':57B '153.7':61B '160':54B 'audio/video':29B 'browser':20B 'bypass':34B 'compon':30B 'condit':25B 'data':45B 'esr':56B,60B 'firefox':21B,27B,53B,55B,59B 'fix':50B 'keep':41B 'let':31B 'origin':38B 'page':33B 'polici':39B 'race':24B 'read':44B 'runtim':22B 'same-origin':36B 'site':48B 'websit':42B","search_c":"'115.45':84C '153.7':88C '160':81C 'audio/video':73C 'bypass':66C 'compon':74C 'condit':70C 'due':67C 'esr':83C,87C 'firefox':80C,82C,86C 'fix':78C 'origin':64C 'polici':65C 'race':69C 'same-origin':62C 'vulner':76C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T14:17:23+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-124902","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124902","severity":null,"published_at":"2026-11-10T14:17:23+00:00","modified_at":"2026-11-10T14:17:23+00:00","first_seen_at":"2026-11-10T14:22:16+00:00","fetched_at":"2026-11-10T14:22:16+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"}