{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-108261", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-10-09T17:33:15.410Z", "datePublished": "2026-10-09T20:43:37.580Z", "dateUpdated": "2026-10-13T11:24:15.591Z"}, "containers": {"cna": {"title": "TinaCMS admin preview iframe loads an attacker-controlled origin from the URL fragment", "problemTypes": [{"descriptions": [{"cweId": "CWE-346", "lang": "en", "description": "CWE-346: Origin Validation Error", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-441", "lang": "en", "description": "CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-601", "lang": "en", "description": "CWE-601: URL Redirection to Untrusted Site ('Open Redirect')", "type": "CWE"}]}], "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"}}], "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"}], "affected": [{"vendor": "tinacms", "product": "tinacms", "versions": [{"version": "< 3.14.0", "status": "affected"}]}, {"vendor": "@tinacms", "product": "app", "versions": [{"version": "< 2.5.14", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-09T20:43:37.580Z"}, "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."}], "source": {"advisory": "GHSA-x34j-47hf-4xg7", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/tinacms/tinacms/security/advisories/GHSA-x34j-47hf-4xg7", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-13T11:22:22.126132Z", "id": "CVE-2026-108261", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-13T11:24:15.591Z"}}]}}

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{"affected": [{"affectedData": [{"product": "tinacms", "vendor": "tinacms", "versions": [{"status": "affected", "version": "< 3.14.0"}]}, {"product": "app", "vendor": "@tinacms", "versions": [{"status": "affected", "version": "< 2.5.14"}]}], "source": "security-advisories@github.com"}], "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."}], "id": "CVE-2026-108261", "lastModified": "2026-10-16T20:04:29.760", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 2.8, "impactScore": 5.8, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-108261", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-13T11:22:22.126132Z", "version": "2.0.3"}}]}, "published": "2026-10-09T21:17:04.347", "references": [{"source": "security-advisories@github.com", "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/tinacms/tinacms/security/advisories/GHSA-x34j-47hf-4xg7"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-346"}, {"lang": "en", "value": "CWE-441"}, {"lang": "en", "value": "CWE-601"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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