CVE-2026-84799: Craft CMS before 5.11.0 PII Disclosure via GraphQL User Relations

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-02 · updated 2026-09-04
Weakness: CWE-285

Description

Craft CMS before 5.11.0 fails to enforce user-group scope filters on native GraphQL user relations including author, authors, uploader, draftCreator, and revisionCreator fields. Attackers with a scoped GraphQL token can query these relations to read usernames, email addresses, and full names of any content author or uploader including administrators.

Affected products

craftcms cms: from 5.0.0-RC1 before 5.11.0 — fixed in 5.11.0

How to fix

Upgrade to a fixed version: craftcms cms 5.11.0. Check the vendor advisory for mitigations.

References

https://github.com/craftcms/cms/security/advisories/GHSA-4w9w-3x96-7ghp
https://www.vulncheck.com/advisories/craft-cms-before-5.11.0-pii-disclosure-via-graphql-user-relations

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