Answer in brief
CVE-2026-108261 records a Critical severity (CVSS 9.3) vulnerability in TinaCMS admin preview iframe loads an attacker-controlled origin from the URL fragment. The current sources do not mark it as known exploited. The current feed maps @tinacms/app (generic), tinacms/tinacms (generic), tinacms (npm), tinacms (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps @tinacms/app (generic), tinacms/tinacms (generic), tinacms (npm), tinacms (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| @tinacms/appgeneric | <2.5.14 | 2.5.14 |
| tinacms/tinacmsgeneric | <3.14.0 | 3.14.0 |
| tinacmsnpm | <=3.13.0 | 3.14.0 |
| tinacmsnpm | >=0 <3.14.0 | 3.14.0 |
| @tinacms/appnpm | <=2.5.13 | 2.5.14 |
| @tinacms/appnpm | >=0 <2.5.14 | 2.5.14 |
Published upstream
Oct 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 9, 2026
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.
Quoted source text, attributed separately from HOL analysis.