vulnerability / NVI-00018310 / Revision 1
@tinacms/cli: Remote Code Execution in @tinacms/cli via Forestry migration — unsanitised __TINA_INTERNAL__ marker in user-controlled YAML labels
GitHub lists this reviewed advisory for @tinacms/cli. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
7.8 high
GitHub source severity; exploitability and local consequence require separate evidence.
As of · GitHub Advisory Database
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
@tinacms/cli
source listed< 2.4.3
## Description ### Summary `@tinacms/cli` contains a Remote Code Execution vulnerability in its Forestry-to-Tina migration command. The internal helper `addVariablesToCode` unquotes any value matching the marker `"__TINA_INTERNAL__:::(.*?):::"` inside the stringified collection JSON. User-supplied `label` and `name` fields from `.forestry/**/*.yml` are placed into that JSON without any sanitisation. An attacker who controls a Forestry-style project can therefore inject arbitrary JavaScript into the generated `tina/templates.{ts,js}` file. The injected code is written at module top level, so it executes **the moment the developer runs `tinacms dev` or `tinacms build`**, with the developer's privileges. ### Details **Vulnerable code path:** 1. `packages/@tinacms/cli/src/cmds/forestry-migrate/util/index.ts` — `transformForestryFieldsToTinaFields()` writes `forestryField.label` (and `.name`) straight into TinaField objects (no sanitisation). 2. `packages/@tinacms/cli/src/cmds/forestry-migrate/util/codeTransformer.ts`, lines 16-22 — the regex-based unquoter: ```ts export const addVariablesToCode = (codeWithTinaPrefix: string) => { const code = codeWithTinaPrefi
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
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- GHSA-4936-9hrh-qqpw ↗
GitHub Advisory Database · vendor advisory
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Public revision history
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- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.