Tina: Code injection via unescaped Git branch name in generated client source

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.2 · CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

EPSS

• CVE-2026-108259: 0.33% estimated exploitation activity in the next 30 days; percentile 26.41 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary @tinacms/cli inserts the raw Git branch value into the generated client.ts source without escaping or encoding. A Git-valid branch name can close the string literal and inject an arbitrary JavaScript expression that executes when the consumer build imports the generated client module. Affected component - Source (branch read): packages/@tinacms/cli/src/cmds/init/templates/config.ts lines 155–172 — reads VERCELGITCOMMITREF, GITHUBBRANCH, or HEAD into config.branch - Transform (URL build): packages/@tinacms/cli/src/next/codegen/index.ts lines 219–253 — createApiUrl() concatenates the raw branch into the API URL with no encodeURIComponent - Sink (template): packages/@tinacms/cli/src/next/codegen/index.ts lines 363–381 — genClient() interpolates the URL into url: '${apiURL}' - Sibling sink: packages/@tinacms/cli/src/next/codegen/codegen/plugin.ts line 55 — url: "${apiURL}" (same pattern, double quotes) Root cause The codegen template at index.ts:376 uses: where apiURL contains…

Published by the source

9 Oct 2026, 20:56 UTC

Last modified by the source

9 Oct 2026, 21:15 UTC

Source last checked

26 Oct 2026, 13:07 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-pwhx-cvv3-qj5c

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-pwhx-cvv3-qj5c

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-pwhx-cvv3-qj5c

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# Patch Next advisory brief: CVE-2026-108259

Advisory: Tina: Code injection via unescaped Git branch name in generated client source
IDs: CVE-2026-108259, GHSA-pwhx-cvv3-qj5c
Record: https://patchnext.com/advisories/cve-2026-108259 (revision 3, source checked 26 Oct 2026, 13:07 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @tinacms/cli 3.0.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @tinacms/cli: affected <= 2.7.0; fixed in 3.0.0

## 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://github.com/advisories/GHSA-pwhx-cvv3-qj5c (GitHub-reviewed advisory GHSA-pwhx-cvv3-qj5c lists affected ranges: npm @tinacms/cli >=0 <=2.7.0)
- Verified: https://osv.dev/vulnerability/GHSA-pwhx-cvv3-qj5c (OSV record GHSA-pwhx-cvv3-qj5c lists affected ranges: npm @tinacms/cli >=0 <3.0.0 (fixed))

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