Answer in brief
CVE-2026-63123 records a Medium severity (CVSS 6.5) vulnerability in Tina: Cross-origin `POST /media/upload/*` requests can write arbitrary files into the Tina dev server media root. The current sources do not mark it as known exploited. The current feed maps tinacms/tinacms (generic), @tinacms/cli (npm), @tinacms/cli (npm). 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 6.5. 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/tinacms (generic), @tinacms/cli (npm), @tinacms/cli (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| tinacms/tinacmsgeneric | < 2.5.2 | Not reported |
| @tinacms/clinpm | >=0 <2.5.2 | 2.5.2 |
| @tinacms/clinpm | <2.5.2 | 2.5.2 |
Published upstream
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 19, 2026
Tina is a headless content management system. Prior to 2.5.2, the TinaCMS CLI package's Vite dev server packages/@tinacms/cli/src/next/vite/cors.ts origin callback returns false for a disallowed origin but does not reject the request, and packages/@tinacms/cli/src/next/vite/plugins.ts still routes POST /media/upload/* to mediaRouter.handlePost. The upload code in packages/@tinacms/cli/src/next/commands/dev-command/server/media.ts writes attacker-controlled multipart contents inside the configured media root. A remote attacker can cause a developer's browser to submit this state-changing request by inducing the developer to visit an attacker-controlled page while tinacms dev is running. This issue is fixed in version 2.5.2.
Quoted source text, attributed separately from HOL analysis.