CVE-2026-63198

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    CVE-2026-63198

    Published: 3 Nov 2026Last Modified: 5 Nov 2026

    Summary: traQ: Privilege escalation by OAuth prompt=none request

    Details: 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.

    References: https://github.com/traPtitech/traQ/releases/tag/v3.28.3, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63198.json, https://github.com/traPtitech/traQ/security/advisories/GHSA-8cfq-jgf7-8m27, https://nvd.nist.gov/vuln/detail/CVE-2026-63198, https://github.com/traPtitech/traQ/commit/5510fe8aa9bb15fc4755c78792381dbb03d576c3

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -e3510c22dc2f94773a9f92c5b0fd0c8e1bbfb59f

    Affected versions

    v3.28.2
    v3.28.1
    v3.28.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-63198 | CVE-DB