traPtitech traQ up to 3.28.2 improper authorization

Summaryinfo

A vulnerability classified as critical has been found in traPtitech traQ up to 3.28.2. This impacts an unknown function. Performing a manipulation results in improper authorization. This vulnerability is reported as CVE-2026-63198. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in traPtitech traQ up to 3.28.2. This affects some unknown processing. The manipulation with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-63198 since 07/16/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

Upgrading to version 3.28.3 eliminates this vulnerability.

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Productinfo

Vendor

• traPtitech

Name

• traQ

Version

• 3.28.0
• 3.28.1
• 3.28.2

Website

• Product: https://github.com/traPtitech/traQ/

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