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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*", "matchCriteriaId": "4BE96625-3609-410C-B41E-4A824C1A57C0", "versionEndExcluding": "2026.1.2", "versionStartIncluding": "2026.1.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*", "matchCriteriaId": "FD31CF04-CF2F-4FB9-8880-9243BC7671A7", "versionEndExcluding": "2026.2.1", "versionStartIncluding": "2026.2.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:discourse:discourse:2026.3.0:*:*:*:latest:*:*:*", "matchCriteriaId": "E3FE9277-4F6B-4FD0-991F-F0FB8D226E1C", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, the discourse-graphviz plugin contains a stored cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious JavaScript code through DOT graph definitions. For instances with CSP disabled only. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, disable the graphviz plugin, upgrade to a patched version, or enable a content security policy."}, {"lang": "es", "value": "Discourse es una plataforma de discusi\u00f3n de c\u00f3digo abierto. Antes de las versiones 2026.3.0-latest.1, 2026.2.1 y 2026.1.2, el plugin discourse-graphviz contiene una vulnerabilidad de cross-site scripting (XSS) almacenado que permite a los usuarios autenticados inyectar c\u00f3digo JavaScript malicioso a trav\u00e9s de definiciones de gr\u00e1ficos DOT. Solo para instancias con CSP deshabilitado. Las versiones 2026.3.0-latest.1, 2026.2.1 y 2026.1.2 contienen un parche. Como soluci\u00f3n alternativa, deshabilite el plugin graphviz, actualice a una versi\u00f3n parcheada o habilite una pol\u00edtica de seguridad de contenido."}], "id": "CVE-2026-33395", "lastModified": "2026-03-24T19:46:59.323", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.3, "impactScore": 2.7, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-03-19T23:16:44.710", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/discourse/discourse/commit/0471e68ed0b594bf386e068f228849244b880ef1"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/discourse/discourse/commit/0c861df8bea03dcc01b60da6cc7038e6c88de4ee"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/discourse/discourse/commit/472f9e1f7855307e489e9eaa6825d5335dfc08b5"}, {"source": "security-advisories@github.com", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://github.com/discourse/discourse/security/advisories/GHSA-23c7-gq89-xm5v"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2026.1.0-latest,2026.1.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2026.2.0-latest,2026.2.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2026.3.0-latest"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "discourse", "source": "cna", "vendor": "discourse"}, "product": "discourse", "vendor": "discourse"}], "analysis": {"en": {"generated_at": "2026-03-24T21:57:39.579992+00:00", "value": {"mitigation_remediation": ["Update Discourse version 2026.3.0-latest.1, 2026.2.1, or 2026.1.2 to apply the patch", "If upgrading is not immediately possible, disable the discourse-graphviz plugin", "Enable a content security policy to block execution of inline JavaScript"], "summary": {"action": "Apply Patch", "impact": "Stored Cross- Site Scripting"}, "threat_synthesis": {"affected_systems": "Affected installations are those running Discourse with the discourse-graphviz plugin on versions prior to 2026.3.0-latest.1, 2026.2.1, or 2026.1.2. All recent releases include a patch that removes the vulnerability. The product is the open-source Discourse discussion platform.", "description_and_impact": "This vulnerability arises from the discourse-graphviz plugin, which allows authenticated users to embed malicious JavaScript in DOT graph definitions that are stored and rendered as SVG. Once an attacker creates a graph containing a javascript: link, the script executes in the browser context of any user who views the graph, enabling theft of session cookies, arbitrary actions, or credential compromise. The weakness maps to CWE-79\u2014stored cross-site scripting.", "risk_and_exploitability": "The CVSS base score of 4.4 indicates medium risk, while an EPSS score of less than 1\u202f% suggests a low probability of exploitation. The flaw is not listed in the CISA KEV catalog, and exploitation requires a logged-in user to create or modify a graph; additionally, it only manifests when the site\u2019s content security policy is disabled. Thus the threat is moderate but limited by the need for authenticated access and an insecure configuration."}}}}, "created": "2026-03-20T08:54:44.595148+00:00", "updated": "2026-03-25T11:54:25.329906+00:00", "vendors": ["discourse", "discourse$PRODUCT$discourse"]}