# CVE-2026-91774

## Summary

- **CVE ID:** CVE-2026-91774
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-862
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 17, 2026

## Description

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.

## Affected Products

- YaoApp — yao (0)

## References

- [CNA](https://github.com/YaoApp/yao/issues/1553)
- [CNA](https://github.com/YaoApp/yao/blob/v1.0.0-rc22/openapi/user/team.go#L80-L149)
- [CNA](https://github.com/YaoApp/yao/blob/v1.0.0-rc22/openapi/oauth/providers/user/team.go#L37-L55)
- [CNA](https://github.com/YaoApp/yao)
- [CNA](https://www.vulncheck.com/advisories/yao-through-1.0.0-rc22-missing-authorization-via-openapi-team-endpoint)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.20%
- **EPSS Percentile:** 10.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._