{"id":"CVE-2026-63203","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-63203","generatedAt":"2026-10-28T03:31:40.904Z","title":"From 1.31.0 until 1.42.0, the Account API handlers in packages/core/src/routes/account/third-party-tokens.ts allow a caller holding a same-user access token with only the openid scope to retrieve stored social or enterprise SSO provider access tokens…","description":"Logto is the modern, open-source auth infrastructure for SaaS and AI apps. From 1.31.0 until 1.42.0, the Account API handlers in packages/core/src/routes/account/third-party-tokens.ts allow a caller holding a same-user access token with only the openid scope to retrieve stored social or enterprise SSO provider access tokens through GET /api/my-account/identities/{target}/access-token or GET /api/my-account/sso-identities/{connectorId}/access-token. The handlers authenticate the user but do not require the identities scope that protects neighboring identity-detail operations, bypassing the intended Account API consent boundary. Exploitation requires federated token-set storage to be enabled and the affected user to have authenticated through a supported connector. A low-trust application can use the disclosed provider token against upstream APIs within that token's granted scopes. This issue is fixed in version 1.42.0.","published":"2026-09-24T16:17:09.000Z","lastModified":"2026-09-24T16:17:09.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":7.6,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N"},"cwe":["CWE-862"],"affected":[],"epss":{"score":0.00311,"percentile":0.23791,"date":"2026-10-26","history":[{"date":"2026-09-25","score":0.00311,"percentile":0.2142}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.31%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-24T16:17:09.000Z","detail":{"score":"7.6","severity":"HIGH","publishedAt":"2026-09-24T16:17:08.700Z"},"summary":"New CVE, high severity (CVSS 7.6)."}],"references":[{"url":"https://github.com/logto-io/logto/commit/b560d17a4da4c25da95e3c73af4485d18ab7c224","source":"security-advisories@github.com"},{"url":"https://github.com/logto-io/logto/pull/9116","source":"security-advisories@github.com"},{"url":"https://github.com/logto-io/logto/releases/tag/v1.42.0","source":"security-advisories@github.com"},{"url":"https://github.com/logto-io/logto/security/advisories/GHSA-6g9q-qrx7-3jxf","source":"security-advisories@github.com"},{"url":"https://github.com/logto-io/logto/security/advisories/GHSA-6g9q-qrx7-3jxf","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63203","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}