What’s Vulnerable › Vulnerabilities

CVE-2026-84796: Craft CMS 5.0.0-RC1 before 5.10.11 GraphQL Entry Mutation Site Scope Bypass

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-02 · updated 2026-09-02
• Weakness: CWE-639

Description

Craft CMS versions before 5.10.11 contain a site scope bypass vulnerability in GraphQL entry mutation resolvers that fail to validate siteId through ArgumentManager::prepareArguments(). Attackers with tokens scoped to one site can read, modify, or delete entries across unauthorized sites by passing siteId directly in mutation arguments.

Affected products

• craftcms cms: from 5.0.0-RC1 before 5.10.11 — fixed in 5.10.11

How to fix

Upgrade to a fixed version: craftcms cms 5.10.11. Check the vendor advisory for mitigations.

References

• https://github.com/craftcms/cms/security/advisories/GHSA-3wcr-p33w-528f
• https://www.vulncheck.com/advisories/craft-cms-5.0.0-rc1-before-5.10.11-graphql-entry-mutation-site-scope-bypass

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