GQL entry mutation `siteId` bypasses schema site scope, enabling cross-site content read/write/delete
Summary
| CVE | CVE-2026-79990 |
|---|---|
| State | PUBLISHED |
| Assigner | Hackrate |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-02 15:17:42 UTC |
| Updated | 2026-09-03 17:45:20 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v4.0 8.7 HIGH from 7004884b-51e2-48e8-b4a2-5ca29e80453e
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.002580000 probability, percentile 0.173590000 (date 2026-09-07)
Problem Types: CWE-639 | CWE-639 CWE-639 Authorization bypass through User-Controlled key
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | 7004884b-51e2-48e8-b4a2-5ca29e80453e | Secondary | 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/E:X/C... |
| 4.0 | CNA | CVSS | 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 v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowAttack Requirements
NonePrivileges Required
LowUser Interaction
NoneConfidentiality
HighIntegrity
HighAvailability
HighSub Conf.
NoneSub Integrity
NoneSub Availability
NoneCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/craftcms/cms/security/advisories/GHSA-3wcr-p33w-528f | 7004884b-51e2-48e8-b4a2-5ca29e80453e | github.com | |
| www.hckrt.com/hacktivity/HCKRT-XEQKMX | 7004884b-51e2-48e8-b4a2-5ca29e80453e | www.hckrt.com | |
| github.com/craftcms/cms/releases/tag/5.10.11 | 7004884b-51e2-48e8-b4a2-5ca29e80453e | github.com | |
| github.com/craftcms/cms | 7004884b-51e2-48e8-b4a2-5ca29e80453e | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: @ddme (en)
CNA: Hackrate (en)
There are currently no legacy QID mappings associated with this CVE.