{"id":"CVE-2026-121637","kind":"vulnerability","aliases":["CVE-2026-121637"],"related":[],"title":"WatchGuard AuthPoint Gateway: forged LDAP authentication results accepted as valid sessions","description":"An improper integrity validation vulnerability in WatchGuard AuthPoint Gateway's LDAP authentication callback allows a network attacker who has obtained a valid header signature to forge the authentication result and transaction identifier in the request body, resulting in unauthorized session outcomes.","summary":"WatchGuard AuthPoint Gateway does not properly check the integrity of its LDAP authentication callback. A network attacker who already holds a valid header signature can forge the authentication result and transaction ID, producing unauthorized session outcomes.","severity":"high","cvss":8.9,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"AuthPoint Authentication Gateway","fixed":["7.6.0"],"affected":">= 1.0, < 7.6.0","ecosystem":"vendor"}],"ecosystems":[],"tags":["authpoint","infrastructure","ldap","mfa","self-hosted","watchguard"],"not_affected_if":["no-ldap-provider","unknown"],"how_to_check":"Only Gateways configured with an LDAP provider are exposed. Check the installed AuthPoint Gateway version (any version >= 1.0 and < 7.6.0 is affected) and whether an LDAP provider/external identity is configured.","fix":"Upgrade AuthPoint Gateway to 7.6.0 or later (WatchGuard PSIRT solution; 7.6.0 released 29 Oct 2026).","status":"open","published_at":"2026-11-04T15:17:42+00:00","first_seen_at":"2026-11-04T15:27:30+00:00","triaged_at":"2026-11-04T15:28:22+00:00","updated_at":"2026-11-04T15:32:14+00:00","category":"infrastructure","confidence":0.85,"triage":{"at":"2026-11-04T15:28:22Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"WatchGuard AuthPoint Gateway: forged LDAP authentication results accepted as valid sessions","impact":"high","summary":"WatchGuard AuthPoint Gateway does not properly check the integrity of its LDAP authentication callback. A network attacker who already holds a valid header signature can forge the authentication result and transaction ID, producing unauthorized session outcomes.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["watchguard","authpoint","ldap","mfa"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"attacker forges authentication results and gains unauthorized sessions","analyst_note":"Find the WatchGuard advisory and affected/fixed AuthPoint Gateway versions and check whether the LDAP callback is enabled by default.","how_to_check":"- unknown","plain_action":"","needs_analyst":true,"not_affected_if":["unknown"],"who_is_affected":"Organizations running WatchGuard AuthPoint Gateway with LDAP authentication callbacks. The sources do not state which versions are affected or which configurations are required. The attacker must first obtain a valid header signature, so exposure depends on how that signature could be obtained.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000656,"input_tokens":4123,"output_tokens":488,"severity_before":"high"},"analyst_status":"done","analyst_note":"Find the WatchGuard advisory and affected/fixed AuthPoint Gateway versions and check whether the LDAP callback is enabled by default.","search":"'-121637':14A,17A '-2026':13A,16A 'accept':8A 'allow':78C 'alreadi':47B 'attack':45B,81C 'authent':6A,41B,56B,76C,92C 'authentication':19A 'authpoint':2A,18A,21B,30B,72C 'bodi':100C 'callback':42B,77C 'check':35B 'cve':12A,15A 'forg':4A,54B,90C 'gateway':3A,20A,31B,73C 'header':51B,87C 'hold':48B 'host':27B 'id':60B 'identifi':96C 'improp':66C 'infrastructur':22B 'integr':37B,67C 'ldap':5A,23B,40B,75C 'mfa':24B 'network':44B,80C 'obtain':84C 'outcom':64B,105C 'produc':61B 'proper':34B 'request':99C 'result':7A,57B,93C,101C 'self':26B 'self-host':25B 'session':11A,63B,104C 'signatur':52B,88C 'transact':59B,95C 'unauthor':62B,103C 'valid':10A,50B,68C,86C 'vulner':69C 'watchguard':1A,28B,29B,71C","nicknames":[],"mitigations":[],"who_affected":"AuthPoint Gateway deployments configured with an LDAP provider, on any version from 1.0 up to but not including 7.6.0. An attacker needs network access and an already-obtained valid header signature, then can forge the authentication result and transaction ID in the callback. Gateways with no LDAP provider configured are outside the vendor's stated exposure; WatchGuard knows of no exploitation.","tier":"B","verified":{"fix":{"at":"2026-11-04T15:32:14Z","by":"analyst","doc":"https://www.watchguard.com/support/release-notes/cloud/Content/en-US/AuthPoint/agent_releases.html","run_id":1680},"products":{"at":"2026-11-04T15:32:14Z","by":"analyst","doc":"https://www.watchguard.com/support/release-notes/cloud/Content/en-US/AuthPoint/agent_releases.html","run_id":1680},"who_affected":{"at":"2026-11-04T15:32:14Z","by":"analyst","doc":"https://www.watchguard.com/support/release-notes/cloud/Content/en-US/AuthPoint/agent_releases.html","run_id":1680}},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":["authenticationgateway","authpointauthenticationgateway"],"ptokens":["authentication","authpoint","gateway"],"labels":["authpoint","high","infrastructure","ldap","mfa","selfhosted","watchguard"],"campaign_type":null,"first_public_at":"2026-11-04T15:17:42+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/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":"5d1c2695-1a31-4499-88ae-e847036fd7e3","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121637","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121637","severity":null,"published_at":"2026-11-04T15:17:42+00:00","modified_at":"2026-11-04T15:17:42+00:00","first_seen_at":"2026-11-04T15:27:30+00:00","fetched_at":"2026-11-04T15:27:30+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-121637:1680","url":null,"severity":null,"published_at":"2026-11-04T15:32:14+00:00","modified_at":"2026-11-04T15:32:14+00:00","first_seen_at":"2026-11-04T15:32:14+00:00","fetched_at":"2026-11-04T15:32:14+00:00","note":"Read WatchGuard PSIRT page: affected >=1.0,<7.6.0, fixed 7.6.0, exposure requires LDAP provider; no known exploitation. LDAP not stated as default; how_to_check is my wording, not verified. Sibling AuthPoint CVEs 121638/121639/121640 share the same fix."}],"documents":[{"id":68007,"url":"https://psirt.watchguard.com/CVE-2026-121637","title":"WatchGuard PSIRT: CVE-2026-121637","kind":"advisory","source":"analyst","publisher":null,"text":null,"published_at":null,"relation":"advisory","confidence":null,"note":null},{"id":68008,"url":"https://www.watchguard.com/support/release-notes/cloud/Content/en-US/AuthPoint/agent_releases.html","title":"AuthPoint Gateway releases (v7.6.0, 29 Oct 2026)","kind":"release","source":"analyst","publisher":null,"text":null,"published_at":null,"relation":"fix","confidence":null,"note":null}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}