{"id":"CVE-2026-33687","state":"PUBLISHED","title":"Sharp has Unrestricted File Upload via Client-Controlled Validation Rules","description":"Sharp is a content management framework built for Laravel as a package. Versions prior to 9.20.0 contain a vulnerability in the file upload endpoint that allows authenticated users to bypass all file type restrictions. The upload endpoint within the `ApiFormUploadController` accepts a client-controlled `validation_rule` parameter. This parameter is directly passed into the Laravel validator without sufficient server-side enforcement. By intercepting the request and sending `validation_rule[]=file`, an attacker can completely bypass all MIME type and file extension restrictions. This issue has been addressed in version 9.20.0 by removing the client-controlled validation rules and strictly defining upload rules server-side. As a workaround, ensure that the storage disk used for Sharp uploads is strictly private. Under default configurations, an attacker cannot directly execute uploaded PHP files unless a public disk configuration is explicitly used.","publishedAt":"2026-03-26T21:47:55.573Z","updatedAt":"2026-03-27T20:28:53.385Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["code16 sharp"],"affected":[{"vendor":"code16","product":"sharp","versions":[{"version":"< 9.20.0","status":"affected"}]}],"references":["https://github.com/code16/sharp/security/advisories/GHSA-fr76-5637-w3g9","https://github.com/code16/sharp/pull/714","https://github.com/code16/sharp/releases/tag/v9.20.0","https://laravel.com/docs/13.x/filesystem"],"weaknesses":["CWE-434"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/33xxx/CVE-2026-33687.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-33687","state":"PUBLISHED","datePublished":"2026-03-26T21:47:55.573Z","dateUpdated":"2026-03-27T20:28:53.385Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-03-23T16:34:59.932Z"},"containers":{"cna":{"title":"Sharp has Unrestricted File Upload via Client-Controlled Validation Rules","descriptions":[{"lang":"en","value":"Sharp is a content management framework built for Laravel as a package. Versions prior to 9.20.0 contain a vulnerability in the file upload endpoint that allows authenticated users to bypass all file type restrictions. The upload endpoint within the `ApiFormUploadController` accepts a client-controlled `validation_rule` parameter. This parameter is directly passed into the Laravel validator without sufficient server-side enforcement. By intercepting the request and sending `validation_rule[]=file`, an attacker can completely bypass all MIME type and file extension restrictions. This issue has been addressed in version 9.20.0 by removing the client-controlled validation rules and strictly defining upload rules server-side. As a workaround, ensure that the storage disk used for Sharp uploads is strictly private. Under default configurations, an attacker cannot directly execute uploaded PHP files unless a public disk configuration is explicitly used."}],"affected":[{"vendor":"code16","product":"sharp","versions":[{"version":"< 9.20.0","status":"affected"}]}],"references":[{"url":"https://github.com/code16/sharp/security/advisories/GHSA-fr76-5637-w3g9","name":"https://github.com/code16/sharp/security/advisories/GHSA-fr76-5637-w3g9","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/code16/sharp/pull/714","name":"https://github.com/code16/sharp/pull/714","tags":["x_refsource_MISC"]},{"url":"https://github.com/code16/sharp/releases/tag/v9.20.0","name":"https://github.com/code16/sharp/releases/tag/v9.20.0","tags":["x_refsource_MISC"]},{"url":"https://laravel.com/docs/13.x/filesystem","name":"https://laravel.com/docs/13.x/filesystem","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-434","lang":"en","description":"CWE-434: Unrestricted Upload of File with Dangerous Type","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-03-26T21:53:26.004Z"},"source":{"advisory":"GHSA-fr76-5637-w3g9","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-27T20:28:24.566534Z","id":"CVE-2026-33687","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-27T20:28:53.385Z"}}]}}}