{"id":"CVE-2026-111699","kind":"vulnerability","aliases":["CVE-2026-111699"],"related":[],"title":"Niefy wx-api: unauthenticated attackers impersonate WeChat fans via openid cookie","description":"Niefy wx-api through 0.8.2 contains an authentication bypass vulnerability that allows unauthenticated attackers to impersonate WeChat fans by supplying a raw openid cookie to fan-facing controllers. Attackers knowing a victim's openid can call /wxUser/getUserInfo and /wxUserTags endpoints to read nickname, phone, unionid and tags, and add or remove fan tags.","summary":"Niefy wx-api through 0.8.2 trusts a raw openid cookie on fan-facing controllers, so no login is checked. An attacker who knows a victim's openid can read that fan's nickname, phone, unionid and tags, and add or remove tags.","severity":"medium","cvss":6.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["go","other","self-hosted","wechat"],"not_affected_if":["default-config"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-10-16T18:17:53+00:00","first_seen_at":"2026-10-23T21:57:13+00:00","triaged_at":"2026-10-25T04:01:53+00:00","updated_at":"2026-10-25T04:01:53+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-10-25T04:01:53Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"internet","title":"Niefy wx-api: unauthenticated attackers impersonate WeChat fans via openid cookie","impact":"medium","summary":"Niefy wx-api through 0.8.2 trusts a raw openid cookie on fan-facing controllers, so no login is checked. An attacker who knows a victim's openid can read that fan's nickname, phone, unionid and tags, and add or remove tags.","category":"other","nicknames":[],"who_cares":["wechat","self-hosted","go"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker reads fan personal data and edits fan tags without logging in","analyst_note":"Confirm the fixed version and any patch or config workaround from the NVD entry or the project repository, since the sources give no fix.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["default-config"],"who_is_affected":"Teams running the Niefy wx-api project (version 0.8.2 or earlier) as a WeChat fan-management backend, where the openid cookie is accepted for /wxUser/getUserInfo and /wxUserTags. Systems that do not run this project are not affected.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000561,"input_tokens":3364,"output_tokens":450,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-111699':15A,18A '-2026':14A,17A '/wxuser/getuserinfo':107C '/wxusertags':109C '0.8.2':30B,74C 'add':65B,119C 'allow':81C 'api':4A,28B,72C 'attack':6A,47B,83C,99C 'authent':77C 'bypass':78C 'call':106C 'check':45B 'contain':75C 'control':40B,98C 'cooki':12A,35B,93C 'cve':13A,16A 'endpoint':110C 'face':39B,97C 'fan':9A,38B,57B,87C,96C,122C 'fan-fac':37B,95C 'go':19B 'host':23B 'imperson':7A,85C 'know':49B,100C 'login':43B 'nicknam':59B,113C 'niefi':1A,25B,69C 'openid':11A,34B,53B,92C,104C 'phone':60B,114C 'raw':33B,91C 'read':55B,112C 'remov':67B,121C 'self':22B 'self-host':21B 'suppli':89C 'tag':63B,68B,117C,123C 'trust':31B 'unauthent':5A,82C 'unionid':61B,115C 'via':10A 'victim':51B,102C 'vulner':79C 'wechat':8A,24B,86C 'wx':3A,27B,71C 'wx-api':2A,26B,70C","nicknames":[],"mitigations":[],"who_affected":"Teams running the Niefy wx-api project (version 0.8.2 or earlier) as a WeChat fan-management backend, where the openid cookie is accepted for /wxUser/getUserInfo and /wxUserTags. Systems that do not run this project are not affected.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-16T18:17:53+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/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":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-111699","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111699","severity":null,"published_at":"2026-10-16T18:17:53+00:00","modified_at":"2026-10-21T21:17:55+00:00","first_seen_at":"2026-10-23T21:57:13+00:00","fetched_at":"2026-10-23T22:28:55+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}