# CVE-2026-124426: Craft CMS before 5.11.2 GraphQL Sites Scope Bypass via localized Field


- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 8 Nov 2026
- **Updated:** 12 Nov 2026
- **Also known as:** GHSA-mj59-pg4q-vh88, GHSA-mp59-9rf5-93wr

## What is CVE-2026-124426?

CVE-2026-124426 is a medium-severity vulnerability in craftcms cms, published on 8 Nov 2026. 

### Official description

Craft CMS from 5.0.0 before 5.11.2 contains an authorization bypass vulnerability that allows unauthenticated attackers to read content from sites outside a GraphQL schema's Sites scope. Attackers can send a POST request to /actions/graphql/api selecting the localized field without the siteId argument to disclose out-of-scope site content.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-124426?


## How do I fix CVE-2026-124426?

No fix has been published for CVE-2026-124426 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-124426 being exploited?

There is no known exploitation of CVE-2026-124426 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-124426 and fix it if it is affected.

What it is: CVE-2026-124426 is a medium-severity vulnerability in craftcms cms, published on 8 Nov 2026. 
Exploitation: There is no known exploitation of CVE-2026-124426 in the wild and no public exploit code.

Affected product: craftcms cms. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2026-124426/ (Markdown: https://insights.sbomify.com/CVE-2026-124426/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-124426
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-124426
- OSV: https://osv.dev/vulnerability/CVE-2026-124426

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-124426/
Summaries are generated and may contain mistakes; the official description above is the record.