{"id":"CVE-2026-124666","kind":"vulnerability","aliases":["CVE-2026-124666"],"related":[],"title":"Apache APISIX: spoofed identity headers can pass authentication on multi-auth routes","description":"Authentication bypass by spoofing vulnerability in Apache APISIX.\n\n\n\nOn a route where multi-auth falls back from wolf-rbac to another successful authenticator, client-supplied Wolf identity headers can remain in the request. A downstream service that relies on those documented headers may therefore receive an identity that was not established by the successful authenticator.\n\n\n\nThis issue affects Apache APISIX: from 3.8.0 through 3.19.0.\n\n\n\nUsers are recommended to upgrade to version 3.20.0, which fixes the issue.","summary":"On Apache APISIX routes using multi-auth, client-supplied wolf-rbac identity headers can survive when authentication falls back to another authenticator. A downstream service that trusts those headers may then accept an identity that was never authenticated.","severity":"medium","cvss":6.4,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["apache-apisix","api-gateway","infrastructure","multi-auth","wolf-rbac"],"not_affected_if":["no-multi-auth","no-wolf-rbac","versions-outside-range"],"how_to_check":"- Check the installed Apache APISIX version; affected range is `3.8.0` through `3.19.0`.\n- Look for routes that combine the `multi-auth` plugin with `wolf-rbac`, and confirm whether downstream services read the Wolf identity headers.","fix":"- Apache APISIX: upgrade to `3.20.0`.","status":"open","published_at":"2026-11-13T18:17:31+00:00","first_seen_at":"2026-11-13T18:49:28+00:00","triaged_at":"2026-11-13T18:51:42+00:00","updated_at":"2026-11-13T18:51:42+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-13T18:51:42Z","model":"claude-haiku-5-5","output":{"fix":"- Apache APISIX: upgrade to `3.20.0`.","reach":"network","title":"Apache APISIX: spoofed identity headers can pass authentication on multi-auth routes","impact":"medium","summary":"On Apache APISIX routes using multi-auth, client-supplied wolf-rbac identity headers can survive when authentication falls back to another authenticator. A downstream service that trusts those headers may then accept an identity that was never authenticated.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["apache-apisix","api-gateway","multi-auth","wolf-rbac"],"confidence":0.6,"fix_status":"available","needs_auth":"unknown","worst_case":"Downstream services accept a spoofed identity as authenticated","analyst_note":"","how_to_check":"- Check the installed Apache APISIX version; affected range is `3.8.0` through `3.19.0`.\n- Look for routes that combine the `multi-auth` plugin with `wolf-rbac`, and confirm whether downstream services read the Wolf identity headers.","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["no-multi-auth","no-wolf-rbac","versions-outside-range"],"who_is_affected":"Exposed only where Apache APISIX routes use multi-auth with wolf-rbac as one of the authenticators, and a downstream service relies on the documented Wolf identity headers. Gateways without multi-auth fallback to wolf-rbac are not described as affected.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"yes","severity_if_unknown":"unknown"},"cost_usd":0.000743,"input_tokens":4612,"output_tokens":563,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-124666':16A,19A '-2026':15A,18A '3.19.0':140C '3.20.0':148C '3.8.0':138C 'accept':67B 'affect':134C 'anoth':56B,96C 'apach':1A,21B,34B,80C,135C 'apache-apisix':20B 'api':24B 'api-gateway':23B 'apisix':2A,22B,35B,81C,136C 'auth':12A,29B,40B,88C 'authent':8A,52B,57B,73B,74C,98C,131C 'back':54B,90C 'bypass':75C 'client':42B,100C 'client-suppli':41B,99C 'cve':14A,17A 'document':117C 'downstream':59B,111C 'establish':127C 'fall':53B,89C 'fix':150C 'gateway':25B 'header':5A,48B,64B,104C,118C 'ident':4A,47B,69B,103C,123C 'infrastructur':26B 'issu':133C,152C 'may':65B,119C 'multi':11A,28B,39B,87C 'multi-auth':10A,27B,38B,86C 'never':72B 'pass':7A 'rbac':32B,46B,94C 'receiv':121C 'recommend':143C 'reli':114C 'remain':106C 'request':109C 'rout':13A,36B,84C 'servic':60B,112C 'spoof':3A,77C 'success':97C,130C 'suppli':43B,101C 'surviv':50B 'therefor':120C 'trust':62B 'upgrad':145C 'use':37B 'user':141C 'version':147C 'vulner':78C 'wolf':31B,45B,93C,102C 'wolf-rbac':30B,44B,92C","nicknames":[],"mitigations":[],"who_affected":"Exposed only where Apache APISIX routes use multi-auth with wolf-rbac as one of the authenticators, and a downstream service relies on the documented Wolf identity headers. Gateways without multi-auth fallback to wolf-rbac are not described as affected.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["apacheapisix","apigateway","infrastructure","medium","multiauth","wolfrbac"],"campaign_type":null,"search_a":"'-124666':16A,19A '-2026':15A,18A 'apach':1A 'apisix':2A 'auth':12A 'authent':8A 'cve':14A,17A 'header':5A 'ident':4A 'multi':11A 'multi-auth':10A 'pass':7A 'rout':13A 'spoof':3A","search_b":"'accept':67B 'anoth':56B 'apach':21B,34B 'apache-apisix':20B 'api':24B 'api-gateway':23B 'apisix':22B,35B 'auth':29B,40B 'authent':52B,57B,73B 'back':54B 'client':42B 'client-suppli':41B 'downstream':59B 'fall':53B 'gateway':25B 'header':48B,64B 'ident':47B,69B 'infrastructur':26B 'may':65B 'multi':28B,39B 'multi-auth':27B,38B 'never':72B 'rbac':32B,46B 'rout':36B 'servic':60B 'suppli':43B 'surviv':50B 'trust':62B 'use':37B 'wolf':31B,45B 'wolf-rbac':30B,44B","search_c":"'3.19.0':140C '3.20.0':148C '3.8.0':138C 'affect':134C 'anoth':96C 'apach':80C,135C 'apisix':81C,136C 'auth':88C 'authent':74C,98C,131C 'back':90C 'bypass':75C 'client':100C 'client-suppli':99C 'document':117C 'downstream':111C 'establish':127C 'fall':89C 'fix':150C 'header':104C,118C 'ident':103C,123C 'issu':133C,152C 'may':119C 'multi':87C 'multi-auth':86C 'rbac':94C 'receiv':121C 'recommend':143C 'reli':114C 'remain':106C 'request':109C 'rout':84C 'servic':112C 'spoof':77C 'success':97C,130C 'suppli':101C 'therefor':120C 'upgrad':145C 'user':141C 'version':147C 'vulner':78C 'wolf':93C,102C 'wolf-rbac':92C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-13T18:17:31+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"security@apache.org","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-124666","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124666","severity":null,"published_at":"2026-11-13T18:17:31+00:00","modified_at":"2026-11-13T18:17:31+00:00","first_seen_at":"2026-11-13T18:49:28+00:00","fetched_at":"2026-11-13T18:49:28+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"}