{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-79990","assignerOrgId":"7004884b-51e2-48e8-b4a2-5ca29e80453e","state":"PUBLISHED","assignerShortName":"Hackrate","dateReserved":"2026-08-25T16:39:03.171Z","datePublished":"2026-09-02T14:19:54.892Z","dateUpdated":"2026-09-02T17:53:23.468Z"},"containers":{"cna":{"providerMetadata":{"orgId":"7004884b-51e2-48e8-b4a2-5ca29e80453e","shortName":"Hackrate","dateUpdated":"2026-09-02T14:19:54.892Z"},"title":"GQL entry mutation `siteId` bypasses schema site scope, enabling cross-site content read/write/delete","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-639","description":"CWE-639 Authorization bypass through User-Controlled key","type":"CWE"}]}],"affected":[{"vendor":"craftcms","product":"cms","collectionURL":"https://packagist.org","packageName":"craftcms/cms","versions":[{"status":"affected","version":"5.0.0-RC1","lessThan":"5.10.11","versionType":"semver"}],"defaultStatus":"unaffected"}],"cpeApplicability":[{"operator":"OR","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:craftcms:cms:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0.0-rc1","versionEndExcluding":"5.10.11"}]}]}],"descriptions":[{"lang":"en","value":"Craft CMS GraphQL entry mutation resolvers (saveEntry, deleteEntry) read siteIddirectly from$argumentswithout passing throughArgumentManagerprepareArguments(), which is the function that enforces site-scope filtering via array_intersect against the GraphQL schema’s allowed sites. The query path (ElementResolverprepareElementQuery) correctly calls prepareArguments()`, so queries to unauthorized sites return empty. But mutations bypass this entirely — an attacker with a token scoped to Site A can create, modify, or delete entries in Site B by passing siteId in the mutations argument.","supportingMedia":[{"type":"text/html","base64":false,"value":"Craft CMS GraphQL entry mutation resolvers (<code>saveEntry</code>,&nbsp;<code>deleteEntry) read&nbsp;</code>siteId<code>directly from</code>$arguments<code>without passing through</code>ArgumentManagerprepareArguments()<code>, which is the function that enforces site-scope filtering via&nbsp;</code>array_intersect<code>&nbsp;against the GraphQL schema’s allowed sites. The query path (</code>ElementResolverprepareElementQuery<code>) correctly calls&nbsp;</code>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.<br>"}]}],"references":[{"url":"https://www.hckrt.com/hacktivity/HCKRT-XEQKMX","tags":["third-party-advisory","technical-description","mitigation"]},{"url":"https://github.com/craftcms/cms/releases/tag/5.10.11","tags":["release-notes"]},{"url":"https://github.com/craftcms/cms","tags":["product"]},{"url":"https://github.com/craftcms/cms/security/advisories/GHSA-3wcr-p33w-528f","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":8.7,"vectorString":"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"}}],"credits":[{"lang":"en","value":"@ddme","type":"reporter"},{"lang":"en","value":"Hackrate","type":"coordinator"}],"source":{"advisory":"GHSA-3wcr-p33w-528f","discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.4"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-02T17:52:53.038505Z","id":"CVE-2026-79990","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-02T17:53:23.468Z"}}]}}