CVE-2026-111699
Deferred Deferred - Pending Action

Authentication Bypass in Niefy wx-api via OpenID Cookie

Publication date: 2026-10-16

Last updated on: 2026-10-16

Assigner: VulnCheck

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.

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Meta Information

Published
2026-10-16
Last Modified
2026-10-16
Generated
2026-10-19
AI Q&A
2026-10-16
EPSS Evaluated
2026-10-18
NVD
CVE-2026-111699
EUVD
EUVD-2026-102990

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
niefy wx-api 0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

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Executive Summary

This vulnerability is an authentication bypass in Niefy wx-api through version 0.8.2. It allows unauthenticated attackers to impersonate WeChat fans by providing a raw openid cookie to specific endpoints. Attackers can then access sensitive user data like nickname, phone, unionid, and tags by calling /wxUser/getUserInfo and /wxUserTags endpoints.

Detection Guidance

Check for unauthorized access to /wxUser/getUserInfo and /wxUserTags endpoints. Monitor for raw openid cookies being supplied without proper authentication. Inspect logs for requests with missing or manipulated session tokens.

Impact Analysis

If you use Niefy wx-api up to version 0.8.2, attackers could exploit this to impersonate users and access their personal data such as phone numbers and WeChat tags. This could lead to privacy breaches, unauthorized actions on user accounts, or misuse of sensitive information.

Compliance Impact

This vulnerability could lead to unauthorized access to personal data, violating GDPR and HIPAA requirements for data protection and access control. Organizations using this software may face compliance violations, legal penalties, and reputational damage due to data breaches.

Mitigation Strategies

Upgrade niefy wx-api to a version beyond 0.8.2. Implement strict input validation for openid cookies. Enforce proper authentication checks on sensitive endpoints. Review and restrict access to /wxUser/getUserInfo and /wxUserTags endpoints.

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