Quick answers
- Is CVE-2026-124426 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-124426 being exploited in the wild.
- How severe is CVE-2026-124426?
- Medium severity, with a CVSS score of 5.3, published 8 November 2026.
- Which products and versions are affected?
- Craft CMS 5.0.0 before 5.11.2.
- Is there a fix for CVE-2026-124426?
- Yes: fixed in 5.11.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-124426 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-124426?
- Check whether you run Craft CMS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 5.11.2
Technical details
An authorization bypass exists in the GraphQL API's handling of the "localized" field when the siteId argument is omitted. Unauthenticated POST requests to /actions/graphql/api can access content from sites outside the schema's Sites scope by selecting the localized element field without specifying the siteId parameter. The vulnerability affects multi-site Craft installations where a schema's Sites scope restricts access to certain sites, but sections are shared across sites; no credentials or authentication are required.
Affected products
- Craft CMS 5.0.0 before 5.11.2
Timeline
- 2026-10-23: disclosed: GitHub Security Advisory (GHSA-mp59-9rf5-93wr) published
- 2026-11-08: advisory: CVE-2026-124426 assigned and published