---
id: CVE-2026-91774
title: >-
  Yao through v1.0.0-rc22 authenticates but fails to authorize the GET
  /user/teams/:id endpoint, allowing any logged-in user to read full team
  records
summary: >-
  Yao through v1.0.0-rc22 authenticates but fails to authorize the GET
  /user/teams/:id endpoint, allowing any logged-in user to read full team
  records. Attackers can supply a known team identifier to retrieve sensitive
  team data including …
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-862
vendor: YaoApp
product: yao
affected:
  - yao <= 1.0.0-rc22
published: '2026-09-15'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T17:17:47.883'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91774'
references:
  - url: 'https://github.com/YaoApp/yao'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/YaoApp/yao/blob/v1.0.0-rc22/openapi/oauth/providers/user/team.go#L37-L55
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/YaoApp/yao/blob/v1.0.0-rc22/openapi/user/team.go#L80-L149
    label: disclosure@vulncheck.com
  - url: 'https://github.com/YaoApp/yao/issues/1553'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/yao-through-1.0.0-rc22-missing-authorization-via-openapi-team-endpoint
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.00342
epssPercentile: 0.25145
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-17T19:16:16.787473Z'
ingestedAt: '2026-09-15T02:19:07.442Z'
---

## Overview

Yao through v1.0.0-rc22 authenticates but fails to authorize the GET /user/teams/:id endpoint, allowing any logged-in user to read full team records. Attackers can supply a known team identifier to retrieve sensitive team data including name, description, owner information, and settings without membership verification.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.