{"id":"CVE-2026-108261","sourceIdentifier":"security-advisories@github.com","published":"2026-10-09T21:17:04.347","lastModified":"2026-10-16T20:04:29.760","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"Tina is a headless content management system. Prior to tinacms 3.14.0 and @tinacms/app 2.5.14, the /~/* admin preview route in packages/tinacms/src/admin/index.tsx can turn an attacker-controlled hash-router splat into an off-origin iframe URL through packages/@tinacms/app/src/preview.tsx, while packages/@tinacms/app/src/lib/preview-origin.ts derives expectedOrigin from that same URL for the GraphQL message channel in packages/@tinacms/app/src/lib/graphql-reducer.ts. An unauthenticated attacker can send a crafted link to a signed-in editor, cause the admin to frame an attacker origin, and have that frame treated as the trusted preview. The attacker-controlled frame can submit GraphQL reads or mutations that the admin executes with the editor credentials, exposing or modifying protected content. This issue is fixed in tinacms 3.14.0 and @tinacms/app 2.5.14."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"tinacms","product":"tinacms","versions":[{"version":"< 3.14.0","status":"affected"}]},{"vendor":"@tinacms","product":"app","versions":[{"version":"< 2.5.14","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","baseScore":9.3,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":5.8}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-10-13T11:22:22.126132Z","id":"CVE-2026-108261","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-346"},{"lang":"en","value":"CWE-441"},{"lang":"en","value":"CWE-601"}]}],"references":[{"url":"https://github.com/tinacms/tinacms/commit/b57dbf4b56201aef15cd92caa49fd12ab96bbecf","source":"security-advisories@github.com"},{"url":"https://github.com/tinacms/tinacms/pull/7522","source":"security-advisories@github.com"},{"url":"https://github.com/tinacms/tinacms/releases/tag/@tinacms/app@2.5.14","source":"security-advisories@github.com"},{"url":"https://github.com/tinacms/tinacms/releases/tag/tinacms@3.14.0","source":"security-advisories@github.com"},{"url":"https://github.com/tinacms/tinacms/security/advisories/GHSA-x34j-47hf-4xg7","source":"security-advisories@github.com"},{"url":"https://github.com/tinacms/tinacms/security/advisories/GHSA-x34j-47hf-4xg7","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}