CVE-2026-63198
HIGH
MEDIUM
Priority: 0.02
BB Relevance:
55/100
Published: 2026-11-03
Modified: 2026-11-12
First seen: 2026-11-03
Status: active
Attack Surface
Network
Low Complexity
Conf. Impact
Integ. Impact
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
Low
UI:
Required
S:
Unchanged
C:
High
I:
High
A:
None
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.
Weakness Classification (1)
Affected Software (2)
| Vendor | Product | Version |
|---|---|---|
| traPtitech | traQ | < 3.28.3 |
| traPtitech | traQ | < 3.28.3 |
References & Advisories (3)
x_refsource_MISC
x_refsource_MISC
x_refsource_CONFIRM