CVE-2026-84796

High

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.

SeverityHigh

CVSS8.8

Exploit probability—

ProductCms

PublishedSep 2, 2026

First seenSep 2, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

craftcms cms5.10.11 or later

Vendor advisories

github.com/craftcms/cms/security/advisories/GHSA-3wcr-p33w-528f

Affected products

Product	Affected versions	Fixed in
craftcms cms	5.0.0-RC1 ≤ v < 5.10.11	5.10.11

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