# CVE-2026-42190: RedwoodSDK: Same-site CSRF in in server actions

> Attackers can perform cross-site request forgery against RedwoodSDK server actions by exploiting missing origin validation, potentially hijacking user sessions.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N`)
- **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:** 8 May 2026
- **Updated:** 12 May 2026
- **Also known as:** GHSA-m2m6-cff5-3w7c

## What is CVE-2026-42190?

CVE-2026-42190 is a medium-severity vulnerability in redwoodjs sdk, published on 8 May 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 version 1.0.0-beta.50 to before version 1.2.3, server actions in rwsdk apply HTTP method enforcement but no origin validation. A request originating from a different origin that the browser treats as same-site can invoke a server action with the victim's session cookie attached. This issue has been patched in version 1.2.3.

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

## Which versions are affected by CVE-2026-42190?

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 | 1.2.3 |
| `rwsdk` | npm | From 1.0.0-beta.50 | 1.2.3 |

Products: Redwoodjs Redwoodsdk.

## How do I fix CVE-2026-42190?

Upgrade rwsdk to 1.2.3 or later.

## Is CVE-2026-42190 being exploited?

There is no known exploitation of CVE-2026-42190 in the wild and no public exploit code.

## Other vulnerabilities in redwoodjs sdk

- [CVE-2026-39371](https://insights.sbomify.com/CVE-2026-39371/): RedwoodSDK has a CSRF vulnerability in server function dispatch via GET requests (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-42190 and fix it if it is affected.

What it is: CVE-2026-42190 is a medium-severity vulnerability in redwoodjs sdk, published on 8 May 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-2026-42190 in the wild and no public exploit code.

Affected packages and fixed versions:
- rwsdk (npm): affected from 1.0.0-beta.50; fixed in 1.2.3
- rwsdk (npm): affected from 1.0.0-beta.50; fixed in 1.2.3

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-2026-42190/ (Markdown: https://insights.sbomify.com/CVE-2026-42190/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-42190
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-42190
- OSV: https://osv.dev/vulnerability/CVE-2026-42190

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-42190/
Summaries are generated and may contain mistakes; the official description above is the record.