{"id":"CVE-2026-63506","sourceIdentifier":"security-advisories@github.com","published":"2026-09-16T21:17:13.163","lastModified":"2026-09-30T17:51:56.193","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"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."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"tinacms","product":"tinacms","versions":[{"version":"< 1.1.4","status":"affected"}]},{"vendor":"@tinacms","product":"auth","versions":[{"version":"< 1.1.4","status":"affected"}]},{"vendor":"tinacms","product":"next-tinacms-azure","versions":[{"version":"< 15.0.1","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-17T15:54:06.674922Z","id":"CVE-2026-63506","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-639"}]}],"references":[{"url":"https://github.com/tinacms/tinacms/commit/0a927a4f8d228dd05ee7ca4be32899bc190e73af","source":"security-advisories@github.com"},{"url":"https://github.com/tinacms/tinacms/pull/7168","source":"security-advisories@github.com"},{"url":"https://github.com/tinacms/tinacms/releases/tag/@tinacms/auth@1.1.4","source":"security-advisories@github.com"},{"url":"https://github.com/tinacms/tinacms/releases/tag/next-tinacms-azure@15.0.1","source":"security-advisories@github.com"},{"url":"https://github.com/tinacms/tinacms/security/advisories/GHSA-g74q-6g2f-874x","source":"security-advisories@github.com"},{"url":"https://github.com/tinacms/tinacms/security/advisories/GHSA-g74q-6g2f-874x","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}