CVE-2026-55420

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-55420", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-16T21:48:43.125Z", "datePublished": "2026-07-09T17:54:07.940Z", "dateUpdated": "2026-07-14T01:08:46.909Z"}, "containers": {"cna": {"title": "Discourse: Remote code execution via pdf uploads", "problemTypes": [{"descriptions": [{"cweId": "CWE-78", "lang": "en", "description": "CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')", "type": "CWE"}]}], "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"}}], "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"}], "affected": [{"vendor": "discourse", "product": "discourse", "versions": [{"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", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-09T17:54:07.940Z"}, "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."}], "source": {"advisory": "GHSA-7wq5-jgww-5rw3", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-14T01:08:36.928611Z", "id": "CVE-2026-55420", "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": "2026-07-14T01:08:46.909Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-55420", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-07-14T01:08:36.928611Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-14T01:08:42.529Z"}}], "cna": {"title": "Discourse: Remote code execution via pdf uploads", "source": {"advisory": "GHSA-7wq5-jgww-5rw3", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}], "affected": [{"vendor": "discourse", "product": "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"}]}], "references": [{"url": "https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3", "name": "https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/discourse/discourse/commit/ca5a7e06167561928556afa2f237d67e459c6914", "name": "https://github.com/discourse/discourse/commit/ca5a7e06167561928556afa2f237d67e459c6914", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/discourse/discourse/releases/tag/v2026.1.5", "name": "https://github.com/discourse/discourse/releases/tag/v2026.1.5", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/discourse/discourse/releases/tag/v2026.4.2", "name": "https://github.com/discourse/discourse/releases/tag/v2026.4.2", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/discourse/discourse/releases/tag/v2026.5.1", "name": "https://github.com/discourse/discourse/releases/tag/v2026.5.1", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/discourse/discourse/releases/tag/v2026.6.0", "name": "https://github.com/discourse/discourse/releases/tag/v2026.6.0", "tags": ["x_refsource_MISC"]}], "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-78", "description": "CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-09T17:54:07.940Z"}}}, "cveMetadata": {"cveId": "CVE-2026-55420", "state": "PUBLISHED", "dateUpdated": "2026-07-14T01:08:46.909Z", "dateReserved": "2026-06-16T21:48:43.125Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-07-09T17:54:07.940Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"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"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*", "matchCriteriaId": "E41661D7-5D61-44CF-BFEA-57C53057A46F", "versionEndExcluding": "2026.1.5", "versionStartIncluding": "2026.1.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*", "matchCriteriaId": "E594AEEC-13D5-48EE-AE07-0C3C25FBBC72", "versionEndExcluding": "2026.4.2", "versionStartIncluding": "2026.4.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*", "matchCriteriaId": "CD722A52-B00A-4548-92CA-807CEB0449B0", "versionEndExcluding": "2026.5.1", "versionStartIncluding": "2026.5.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:discourse:discourse:2026.6.0:*:*:*:latest:*:*:*", "matchCriteriaId": "F2E7E180-2D99-484E-80A8-12F706ABDE65", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}], "id": "CVE-2026-55420", "lastModified": "2026-07-14T02:16:56.050", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 1.6, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55420", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-07-14T01:08:36.928611Z", "version": "2.0.3"}}]}, "published": "2026-07-09T18:16:54.440", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/discourse/discourse/commit/ca5a7e06167561928556afa2f237d67e459c6914"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/discourse/discourse/releases/tag/v2026.1.5"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/discourse/discourse/releases/tag/v2026.4.2"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/discourse/discourse/releases/tag/v2026.5.1"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/discourse/discourse/releases/tag/v2026.6.0"}, {"source": "security-advisories@github.com", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-78"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2026.5.0-latest,2026.5.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2026.4.0-latest,2026.4.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2026.1.0-latest,2026.1.5)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "discourse", "source": "cna", "vendor": "discourse"}, "product": "discourse", "vendor": "discourse"}], "created": "2026-07-09T19:30:17.378517+00:00", "updated": "2026-08-01T14:15:03.801558+00:00", "vendors": ["discourse", "discourse$PRODUCT$discourse"]}