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This issue is fixed in version 3.28.3.","state":0,"publishedAt":"2026-11-03T18:38:35.87+00:00","modifiedAt":"2026-11-03T19:37:45.325+00:00","affected":[{"ecosystem":"Vendor product","name":"traQ","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"traPtitech\",\n                    \"product\": \"traQ\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 3.28.3\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N","score":7.3,"severity":"HIGH"}],"references":["https://github.com/traPtitech/traQ/security/advisories/GHSA-8cfq-jgf7-8m27","https://github.com/traPtitech/traQ/commit/5510fe8aa9bb15fc4755c78792381dbb03d576c3","https://github.com/traPtitech/traQ/releases/tag/v3.28.3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63198","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-63198","identifiers":["CVE-2026-63198"]},"retained":false,"historicalAffected":[]},{"revision":"6811a5d0cb4b4d2b9f84238c180689c6","observedAt":"2026-11-13T22:08:35.309+00:00","statement":{"source":"euvd","id":"EUVD-2026-116132","aliases":["CVE-2026-63198","GHSA-8cfq-jgf7-8m27"],"title":"traQ is a messenger application built for Digital Creators Club traP. 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This issue is fixed in version 3.28.3.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N","score":7.3,"severity":null}],"references":["https://github.com/traPtitech/traQ/security/advisories/GHSA-8cfq-jgf7-8m27","https://github.com/traPtitech/traQ/commit/5510fe8aa9bb15fc4755c78792381dbb03d576c3","https://github.com/traPtitech/traQ/releases/tag/v3.28.3"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-116132","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Nov 3, 2026, 6:38:35 PM","dateUpdated":"Nov 3, 2026, 7:37:45 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. 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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.","state":0,"publishedAt":"2026-11-03T19:18:09.08+00:00","modifiedAt":"2026-11-12T22:18:51.47+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N","score":7.3,"severity":"HIGH"}],"references":["https://github.com/traPtitech/traQ/commit/5510fe8aa9bb15fc4755c78792381dbb03d576c3","https://github.com/traPtitech/traQ/releases/tag/v3.28.3","https://github.com/traPtitech/traQ/security/advisories/GHSA-8cfq-jgf7-8m27"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63198","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-863"],"productCriteria":[],"sourceDates":{"published":"2026-11-03T19:18:09.080","lastModified":"2026-11-12T22:18:51.470"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-63198","identifiers":["CVE-2026-63198"]},"retained":false,"historicalAffected":[]},{"revision":"88c680d3049e4fdeb57035133393947f","observedAt":"2026-11-09T21:04:16.984+00:00","statement":{"source":"osv","id":"GHSA-8cfq-jgf7-8m27","aliases":["CVE-2026-63198"],"title":"traQ: Privilege escalation by OAuth prompt=none request","description":"In OAuth2 silent authorization (`prompt=none`), when the `scope` parameter was empty or omitted, all scopes registered for the OAuth client became eligible for issuance. However, the prior consent check was performed against the empty requested scope set. As a result, an attacker could obtain an access token with broader scopes than the user had previously consented to, without requiring additional consent.\n\n## Impact\n\nIf an attacker controls an OAuth client capable of receiving authorization codes, and a user has already consented to only a subset of that client’s scopes, the attacker may be able to obtain a token containing all scopes registered for that client by sending an authorization request with `prompt=none` and an empty or omitted `scope`.\n\nIf the user has not consented to the client at all, `consent_required` is returned as usual.\n\n## Patches\n\nThis issue has been fixed in v3.28.3. After the fix, the consent check for `prompt=none` verifies the scopes that will actually be issued, rather than the empty requested scope set. If the user has not consented to all scopes after expansion, `consent_required` is returned.\n\ntraQ also recommends revoking any existing OAuth tokens created before the fix if they were potentially affected.\n\n## Workarounds\n\nIf users cannot update immediately, they should apply the following mitigations:\n\n- Disable untrusted OAuth clients, minimize registered client scopes, and revoke existing tokens\n- Reject authorization requests with `prompt=none` where `scope` is empty or omitted","state":0,"publishedAt":"2026-11-09T20:55:17+00:00","modifiedAt":"2026-11-09T21:00:04.0493189+00:00","affected":[{"ecosystem":"Go","name":"github.com/traPtitech/traQ","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.0.0-rc.2.0.20260629134940-5510fe8aa9bb"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["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","https://github.com/traPtitech/traQ","https://github.com/traPtitech/traQ/releases/tag/v3.28.3"],"sourceUrl":"https://github.com/advisories/GHSA-8cfq-jgf7-8m27","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-8cfq-jgf7-8m27","identifiers":["GHSA-8cfq-jgf7-8m27","CVE-2026-63198"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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