CVE-2026-63198— traQ: Privilege escalation by OAuth prompt=none request
Quick assessment
Affected
traPtitech traQ
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
traQ 是一款专为 Digital Creators Club traP 打造的即时通讯应用。在 3.28.3 版本之前，当使用 参数发起 OAuth 2.0 静默授权请求时，若作用域（scope）参数为空或被省略，系统会针对空的作用域集合进行先前的同意状态检查；然而，实际上该客户端注册的所有作用域均具备颁发资格。攻击者若控制一个能够接收授权码的 OAuth 客户端，即可针对曾仅同意部分作用域的用户发起攻击，从而在无需用户再次授权的情况下，获取包含更广泛注册作用域的访问令牌。对于从未同意过该客户端的用户，系统仍会
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| traPtitech | traQ | < 3.28.3 |
affected |
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I. Basic Information for CVE-2026-63198
Vulnerability Information
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Vulnerability Title
traQ: Privilege escalation by OAuth prompt=none request
Source: CVE Program / CVE List V5
Vulnerability Description
traQ is a messenger application built for Digital Creators Club traP. Prior to 3.28.3, OAuth2 silent authorization requests using prompt=none with an empty or omitted scope parameter check prior consent against the empty requested scope set even though all scopes registered for the client become eligible for issuance. An attacker who controls an OAuth client capable of receiving authorization codes can target a user who previously consented to only some client scopes and obtain an access token containing broader registered scopes without additional consent. A user who has never consented to the client still receives consent_required. This issue is fixed in version 3.28.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| traPtitech | traQ | < 3.28.3 | - |
|
II. Public POCs for CVE-2026-63198
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-63198 (3)
-
https://github.com/traPtitech/traQ/releases/tag/v3.28.3 x_refsource_MISC
-
https://github.com/traPtitech/traQ/security/advisories/GHSA-8cfq-jgf7-8m27 x_refsource_CONFIRM