{"api_version":"1","generated_at":"2026-07-10T12:42:04+00:00","cve":"CVE-2026-55420","urls":{"html":"https://cve.report/CVE-2026-55420","api":"https://cve.report/api/cve/CVE-2026-55420.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-55420","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-55420"},"summary":{"title":"Discourse: Remote code execution via pdf uploads","description":"Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, under certain non-default configurations, processing of PDF uploads could be exploited to obtain RCE on the server. This issue is patched in 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.","state":"PUBLISHED","assigner":"GitHub_M","published_at":"2026-07-09 18:16:54","updated_at":"2026-07-09 19:33:38"},"problem_types":["CWE-78","CWE-78 CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')"],"metrics":[{"version":"3.1","source":"security-advisories@github.com","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://github.com/discourse/discourse/releases/tag/v2026.5.1","name":"https://github.com/discourse/discourse/releases/tag/v2026.5.1","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/discourse/discourse/commit/ca5a7e06167561928556afa2f237d67e459c6914","name":"https://github.com/discourse/discourse/commit/ca5a7e06167561928556afa2f237d67e459c6914","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/discourse/discourse/releases/tag/v2026.6.0","name":"https://github.com/discourse/discourse/releases/tag/v2026.6.0","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/discourse/discourse/releases/tag/v2026.1.5","name":"https://github.com/discourse/discourse/releases/tag/v2026.1.5","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3","name":"https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/discourse/discourse/releases/tag/v2026.4.2","name":"https://github.com/discourse/discourse/releases/tag/v2026.4.2","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-55420","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55420","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"discourse","product":"discourse","version":"affected >= 2026.5.0-latest, < 2026.5.1","platforms":[]},{"source":"CNA","vendor":"discourse","product":"discourse","version":"affected >= 2026.4.0-latest, < 2026.4.2","platforms":[]},{"source":"CNA","vendor":"discourse","product":"discourse","version":"affected >= 2026.1.0-latest, < 2026.1.5","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"product":"discourse","vendor":"discourse","versions":[{"status":"affected","version":">= 2026.5.0-latest, < 2026.5.1"},{"status":"affected","version":">= 2026.4.0-latest, < 2026.4.2"},{"status":"affected","version":">= 2026.1.0-latest, < 2026.1.5"}]}],"descriptions":[{"lang":"en","value":"Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, under certain non-default configurations, processing of PDF uploads could be exploited to obtain RCE on the server. This issue is patched in 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5."}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-78","description":"CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-07-09T17:54:07.940Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"name":"https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3"},{"name":"https://github.com/discourse/discourse/commit/ca5a7e06167561928556afa2f237d67e459c6914","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/ca5a7e06167561928556afa2f237d67e459c6914"},{"name":"https://github.com/discourse/discourse/releases/tag/v2026.1.5","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/releases/tag/v2026.1.5"},{"name":"https://github.com/discourse/discourse/releases/tag/v2026.4.2","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/releases/tag/v2026.4.2"},{"name":"https://github.com/discourse/discourse/releases/tag/v2026.5.1","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/releases/tag/v2026.5.1"},{"name":"https://github.com/discourse/discourse/releases/tag/v2026.6.0","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/releases/tag/v2026.6.0"}],"source":{"advisory":"GHSA-7wq5-jgww-5rw3","discovery":"UNKNOWN"},"title":"Discourse: Remote code execution via pdf uploads"}},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2026-55420","datePublished":"2026-07-09T17:54:07.940Z","dateReserved":"2026-06-16T21:48:43.125Z","dateUpdated":"2026-07-09T17:54:07.940Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-09 18:16:54","lastModifiedDate":"2026-07-09 19:33:38","problem_types":["CWE-78","CWE-78 CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')"],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.6,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"55420","Ordinal":"1","Title":"Discourse: Remote code execution via pdf uploads","CVE":"CVE-2026-55420","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"55420","Ordinal":"1","NoteData":"Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, under certain non-default configurations, processing of PDF uploads could be exploited to obtain RCE on the server. This issue is patched in 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.","Type":"Description","Title":"Discourse: Remote code execution via pdf uploads"}]}}}