CVE-2026-84796

8.7 highEPSS 0.5%

High (8.7). EPSS 0.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

8.7 high

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

8.8 high

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 40% of CVEs (scores of 2026-10-31)
CWE: CWE-639
Published: 2026-09-02
Modified: 2026-09-02
Record from: the NVD, synced 2026-10-19

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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