{"api_version":"1","generated_at":"2026-10-10T14:19:00+00:00","cve":"CVE-2026-108261","urls":{"html":"https://cve.report/CVE-2026-108261","api":"https://cve.report/api/cve/CVE-2026-108261.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-108261","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-108261"},"summary":{"title":"TinaCMS admin preview iframe loads an attacker-controlled origin from the URL fragment","description":"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. 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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."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.3,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-346","description":"CWE-346: Origin Validation Error","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-441","description":"CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-601","description":"CWE-601: URL Redirection to Untrusted Site ('Open Redirect')","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-10-09T20:43:37.580Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"name":"https://github.com/tinacms/tinacms/security/advisories/GHSA-x34j-47hf-4xg7","tags":["x_refsource_CONFIRM"],"url":"https://github.com/tinacms/tinacms/security/advisories/GHSA-x34j-47hf-4xg7"},{"name":"https://github.com/tinacms/tinacms/pull/7522","tags":["x_refsource_MISC"],"url":"https://github.com/tinacms/tinacms/pull/7522"},{"name":"https://github.com/tinacms/tinacms/commit/b57dbf4b56201aef15cd92caa49fd12ab96bbecf","tags":["x_refsource_MISC"],"url":"https://github.com/tinacms/tinacms/commit/b57dbf4b56201aef15cd92caa49fd12ab96bbecf"},{"name":"https://github.com/tinacms/tinacms/releases/tag/@tinacms/app@2.5.14","tags":["x_refsource_MISC"],"url":"https://github.com/tinacms/tinacms/releases/tag/@tinacms/app@2.5.14"},{"name":"https://github.com/tinacms/tinacms/releases/tag/tinacms@3.14.0","tags":["x_refsource_MISC"],"url":"https://github.com/tinacms/tinacms/releases/tag/tinacms@3.14.0"}],"source":{"advisory":"GHSA-x34j-47hf-4xg7","discovery":"UNKNOWN"},"title":"TinaCMS admin preview iframe loads an attacker-controlled origin from the URL fragment"}},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2026-108261","datePublished":"2026-10-09T20:43:37.580Z","dateReserved":"2026-10-09T17:33:15.410Z","dateUpdated":"2026-10-09T20:43:37.580Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-09 21:17:04","lastModifiedDate":"2026-10-09 21:17:04","problem_types":["CWE-346","CWE-441","CWE-601","CWE-346 CWE-346: Origin Validation Error","CWE-441 CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')","CWE-601 CWE-601: URL Redirection to Untrusted Site ('Open Redirect')"],"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}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"108261","Ordinal":"1","Title":"TinaCMS admin preview iframe loads an attacker-controlled origin","CVE":"CVE-2026-108261","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"108261","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"TinaCMS admin preview iframe loads an attacker-controlled origin"}]}}}