{"cve":"CVE-2026-63506","nvd":{"published":"2026-09-16T21:17:13.163","modified":"2026-09-30T17:51:56.193","status":"Deferred","description":"Tina is a headless content management system. Prior to @tinacms/auth 1.1.4 and next-tinacms-azure 15.0.1, isAuthorized accepts a request-controlled clientID and asks isUserAuthorized to validate the bearer token against that selected TinaCloud app instead of the self-hosted site's configured app. An attacker with any TinaCloud account can submit the attacker's own app ID and valid token to a victim endpoint, causing TinaCloudBackendAuthProvider or an affected media authorized callback to accept the attacker's verified status across the tenant boundary. The vulnerable logic is present in packages/@tinacms/auth/src/index.ts and packages/next-tinacms-azure/src/auth.ts. Successful exploitation permits media listing, reading, upload, or deletion and, when TinaCloudBackendAuthProvider is used, GraphQL read, create, update, and delete operations on the victim's content without a victim account or victim interaction. This vulnerability is fixed in @tinacms/auth 1.1.4 and next-tinacms-azure 15.0.1.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-639"],"references":["https://github.com/tinacms/tinacms/commit/0a927a4f8d228dd05ee7ca4be32899bc190e73af","https://github.com/tinacms/tinacms/pull/7168","https://github.com/tinacms/tinacms/releases/tag/@tinacms/auth@1.1.4","https://github.com/tinacms/tinacms/releases/tag/next-tinacms-azure@15.0.1","https://github.com/tinacms/tinacms/security/advisories/GHSA-g74q-6g2f-874x"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:54:41.405518556+00:00"},"epss":{"cve":"CVE-2026-63506","score":0.00523,"percentile":0.44108,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-g74q-6g2f-874x","url":"https://osv.dev/vulnerability/GHSA-g74q-6g2f-874x","summary":"Tina: [Broken Access Control] letting any TinaCloud user authorize against any self-hosted site","modified":"2026-09-17T16:32:22.069506300Z","packages":[{"ecosystem":"npm","name":"@tinacms/auth","purl":"pkg:npm/%40tinacms/auth","ranges":["<1.1.4"],"fixed":["1.1.4"]},{"ecosystem":"npm","name":"next-tinacms-azure","purl":"pkg:npm/next-tinacms-azure","ranges":["<15.0.1"],"fixed":["15.0.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}