# CVE-2026-39371: RedwoodSDK has a CSRF vulnerability in server function dispatch via GET requests

> Attackers can trigger state-changing server functions via GET requests in cookie-authenticated RedwoodSDK applications, leading to unauthorized data modification.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 7 Apr 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-x8rx-789c-2pxq

## What is CVE-2026-39371?

CVE-2026-39371 is a high-severity vulnerability in redwoodjs sdk, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

RedwoodSDK is a server-first React framework. From 1.0.0-beta.50 to 1.0.5, erver functions exported from "use server" files could be invoked via GET requests, bypassing their intended HTTP method. In cookie-authenticated applications, this allowed cross-site GET navigations to trigger state-changing functions, because browsers send SameSite=Lax cookies on top-level GET requests. This affected all server functions -- both serverAction() handlers and bare exported functions in "use server" files. This vulnerability is fixed in 1.0.6.

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2026-39371?

2 open source packages ship an affected version, including rwsdk. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `rwsdk` | npm | From 1.0.0-beta.50 | 1.0.6 |
| `rwsdk` | npm | From 1.0.0-beta.50 | 1.0.6 |

Products: Redwoodjs Redwoodsdk.

## How do I fix CVE-2026-39371?

Upgrade rwsdk to 1.0.6 or later.

## Is CVE-2026-39371 being exploited?

There is no known exploitation of CVE-2026-39371 in the wild and no public exploit code.

Public exploit code:

- Advisory for rwsdk sdk ⌯⌲ 5000 weekly downloads (github_poc): https://github.com/zebbernCVE/CVE-2026-39371

## Other vulnerabilities in redwoodjs sdk

- [CVE-2026-42190](https://insights.sbomify.com/CVE-2026-42190/): RedwoodSDK: Same-site CSRF in in server actions (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-39371 and fix it if it is affected.

What it is: CVE-2026-39371 is a high-severity vulnerability in redwoodjs sdk, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-39371 in the wild and no public exploit code.

Affected packages and fixed versions:
- rwsdk (npm): affected from 1.0.0-beta.50; fixed in 1.0.6
- rwsdk (npm): affected from 1.0.0-beta.50; fixed in 1.0.6

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-39371/ (Markdown: https://insights.sbomify.com/CVE-2026-39371/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-39371
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-39371
- OSV: https://osv.dev/vulnerability/CVE-2026-39371

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-39371/
Summaries are generated and may contain mistakes; the official description above is the record.