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PatchSiren cyber security CVE debrief

CVE-2026-111699 niefy CVE debrief

CVE-2026-111699 is an authentication bypass vulnerability in Niefy's wx-api through version 0.8.2. The vulnerability 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.

Vendor
niefy
Product
wx-api
CVSS
MEDIUM 6.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-16
Original CVE updated
2026-10-21
Advisory published
2026-10-16
Advisory updated
2026-10-21

Who should care

Defenders responsible for wx-api deployments should assess exposure and verify the authenticity of openid cookies to prevent unauthorized access. This includes reviewing the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. They should also plan vendor-supported updates or mitigations through normal change control where exposure is confirmed and review compensating controls for exposed systems while remedi

Why it matters

CVE-2026-111699 is a medium-severity authentication bypass vulnerability in wx-api through version 0.8.2, allowing unauthenticated attackers to impersonate WeChat fans and access sensitive endpoints.

  • Impersonation of WeChat fans by unauthenticated attackers
  • Unauthorized access to sensitive endpoints
  • Potential data exposure through /wxUser/getUserInfo and /wxUserTags endpoints

Technical summary

The vulnerability is caused by an unverified openid cookie in wx-api through version 0.8.2, allowing unauthenticated attackers to impersonate WeChat fans and access sensitive endpoints such as /wxUser/getUserInfo and /wxUserTags to read nickname, phone, unionid and tags, and add or remove fan tags. The vulnerability has a medium severity with a CVSS score of 6.3 and is classified as MEDIUM. Defenders should prioritize verifying the authenticity of openid cookies and restrict access to sensitive endpoints to prevent unauthorized access.

Defensive priority

Defenders should prioritize verifying the authenticity of openid cookies and restrict access to sensitive endpoints.

Recommended defensive actions

  • Verify the authenticity of openid cookies
  • Restrict access to sensitive endpoints
  • Monitor for suspicious activity on /wxUser/getUserInfo and /wxUserTags endpoints
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description, affected versions, and references to technical descriptions and advisories. The vulnerability 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. To verify the authenticity of openid cookies, defenders should check

Sources and references

Verified primary and authoritative sources

  • CVE-2026-111699 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-111699

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-111699 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-111699

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Niefy wx-api through 0.8.2 Authentication Bypass via Unverified openid Cookie

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/111xxx/CVE-2026-111699.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://hackmd.io/@hieuPenguinnn/wx-api-cross-tenant-idor-and-unauth-fan-pii

    Supplemental source - third-party-advisory

  • Source reference

    Unverified legacy reference

    URL: https://github.com/niefy/wx-api/blob/0.8.2/src/main/java/com/github/niefy/modules/wx/controller/WxUserController.java

    Supplemental source - technical-description

  • Source reference

    Unverified legacy reference

    URL: https://github.com/niefy/wx-api/blob/0.8.2/src/main/java/com/github/niefy/modules/wx/controller/WxUserTagsController.java

    Supplemental source - technical-description

  • Source reference

    Unverified legacy reference

    URL: https://github.com/niefy/wx-api/blob/0.8.2/src/main/java/com/github/niefy/config/ShiroConfig.java

    Supplemental source - technical-description

  • Source reference

    Unverified legacy reference

    URL: https://www.vulncheck.com/advisories/niefy-wx-api-through-0.8.2-authentication-bypass-via-unverified-openid-cookie

    Supplemental source - third-party-advisory

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.