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High, CVSS 7.8amended

@tinacms/cli: Remote Code Execution in @tinacms/cli via Forestry migration — unsanitised __TINA_INTERNAL__ marker in user-controlled YAML labels

CVE-2026-54074GHSA-4936-9hrh-qqpw

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@tinacms/cli 2.4.3), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.8 · CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
  • CVE-2026-54074: 0.25% estimated exploitation activity in the next 30 days; percentile 16.51 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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 "TINAINTERNAL:::(.?):::" 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…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-4936-9hrh-qqpw

  2. Revision 1 · created ·

    Published from osv record GHSA-4936-9hrh-qqpw

Agent brief

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# Patch Next advisory brief: CVE-2026-54074

Advisory: @tinacms/cli: Remote Code Execution in @tinacms/cli via Forestry migration — unsanitised __TINA_INTERNAL__ marker in user-controlled YAML labels
IDs: CVE-2026-54074, GHSA-4936-9hrh-qqpw
Record: https://patchnext.com/advisories/cve-2026-54074 (revision 2, source checked 26 Oct 2026, 12:56 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @tinacms/cli 2.4.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @tinacms/cli: affected < 2.4.3; fixed in 2.4.3

## Suggested inspection (read-only)
- `npm ls @tinacms/cli --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @tinacms/cli.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-4936-9hrh-qqpw (OSV record GHSA-4936-9hrh-qqpw lists affected ranges: npm @tinacms/cli >=0 <2.4.3 (fixed))
- Verified: https://github.com/advisories/GHSA-4936-9hrh-qqpw (GitHub-reviewed advisory GHSA-4936-9hrh-qqpw lists affected ranges: npm @tinacms/cli >=0 <2.4.3)

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