Craft CMS up to 5.10.12 GraphQL Entry Mutation Resolver saveEntry/deleteEntry siteId improper authorization

Summaryinfo

A vulnerability has been found in Craft CMS up to 5.10.12 and classified as critical. The impacted element is the function saveEntry/deleteEntry of the component GraphQL Entry Mutation Resolver. Performing a manipulation of the argument siteId results in improper authorization. This vulnerability was named CVE-2026-79991. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as critical, was found in Craft CMS up to 5.10.12. This affects the function saveEntry/deleteEntry of the component GraphQL Entry Mutation Resolver. The manipulation of the argument siteId with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Craft CMS GraphQL entry mutation resolvers (saveEntry, deleteEntry) read siteIddirectly from$argumentswithout passing throughArgumentManagerprepareArguments(), which is the function that enforces site-scope filtering via array_intersect against the GraphQL schema’s allowed sites. The query path (ElementResolverprepareElementQuery) correctly calls prepareArguments()`, so queries to unauthorized sites return empty. But mutations bypass this entirely — an attacker with a token scoped to Site A can create, modify, or delete entries in Site B by passing siteId in the mutations argument.

It is possible to read the advisory at hckrt.com. This vulnerability is uniquely identified as CVE-2026-79991 since 08/25/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

Upgrading to version 5.10.13 eliminates this vulnerability.

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Productinfo

Type

• Content Management System

Name

• Craft CMS

Version

• 5.10.0
• 5.10.1
• 5.10.2
• 5.10.3
• 5.10.4
• 5.10.5
• 5.10.6
• 5.10.7
• 5.10.8
• 5.10.9
• 5.10.10
• 5.10.11
• 5.10.12

License

• free

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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