What is CVE-2026-63198?

CVE-2026-63198 is a high-severity vulnerability in Traptitech Traq, classified under Incorrect Authorization. CVSS score: 7.3/10. Published 2026-11-03.

How severe is CVE-2026-63198?

High severity. CVSS v3 base score is 7.3 out of 10.

Auth bypass in Traptitech Traq

CVE-2026-63198

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.

Vulnerability class: Broken Access Control

Published 2026-11-03 · last modified 2026-11-03.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Traptitech Traq — versions < 3.28.3

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

Frequently asked questions

What is CVE-2026-63198?: CVE-2026-63198 is a high-severity vulnerability in Traptitech Traq, classified under Incorrect Authorization. CVSS score: 7.3/10. Published 2026-11-03.
How severe is CVE-2026-63198?: High severity. CVSS v3 base score is 7.3 out of 10.