{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-32243", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-11T14:47:05.685Z", "datePublished": "2026-03-31T17:39:38.318Z", "dateUpdated": "2026-04-03T16:18:12.209Z"}, "containers": {"cna": {"title": "Discourse: Stored XSS in discourse-ai shared conversations onebox", "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/discourse/discourse/security/advisories/GHSA-pjc5-8x3w-rfwx", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/discourse/discourse/security/advisories/GHSA-pjc5-8x3w-rfwx"}, {"name": "https://github.com/discourse/discourse/commit/cac7d618a562ce934f8dbf73cdb70066a4806b4c", "tags": ["x_refsource_MISC"], "url": "https://github.com/discourse/discourse/commit/cac7d618a562ce934f8dbf73cdb70066a4806b4c"}], "affected": [{"vendor": "discourse", "product": "discourse", "versions": [{"version": ">= 2026.1.0-latest, < 2026.1.3", "status": "affected"}, {"version": ">= 2026.2.0-latest, < 2026.2.2", "status": "affected"}, {"version": ">= 2026.3.0-latest, < 2026.3.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-31T17:39:38.318Z"}, "descriptions": [{"lang": "en", "value": "Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, an attacker with the ability to create shared AI conversations could inject arbitrary HTML and JavaScript via crafted conversation titles. This payload would execute in the browser of any user viewing the onebox preview, potentially allowing session hijacking or unauthorized actions on behalf of the victim. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0."}], "source": {"advisory": "GHSA-pjc5-8x3w-rfwx", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.1, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-04-03T16:17:35.426416Z", "id": "CVE-2026-32243", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-03T16:18:12.209Z"}}]}}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2026.1.0-latest,2026.1.3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2026.2.0-latest,2026.2.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2026.3.0-latest,2026.3.0)"}}], "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": "2026-03-31T19:22:22.342905+00:00", "value": {"mitigation_remediation": ["Upgrade to Discourse 2026.1.3 or later, 2026.2.2 or later, or 2026.3.0 or later, which contain the patch for this XSS flaw.", "If an upgrade is not immediately possible, restrict the ability to create shared AI conversations to trusted users or disable the feature entirely.", "Monitor user\u2011generated content for unexpected or suspicious HTML or JavaScript injection attempts.", "Apply general web application security best practices, such as regular patching, input validation, and content security policies, to reduce the impact of similar vulnerabilities."], "summary": {"action": "Immediate Patch", "impact": "Cross\u2011Site Scripting (XSS)"}, "threat_synthesis": {"affected_systems": "The flaw affects the Discourse open\u2011source discussion platform. Versions from 2026.1.0 up to 2026.1.2, from 2026.2.0 up to 2026.2.1, and the 2026.3.0 release before the patch are impacted. The vulnerability was addressed in Discourse 2026.1.3, 2026.2.2, and 2026.3.0 and later releases.", "description_and_impact": "An attacker who can create shared AI conversations may insert malicious HTML and JavaScript into the conversation title. When a user views the onebox preview of the shared conversation, the injected payload runs in the victim\u2019s browser, enabling actions such as session hijacking or unauthorized commands executed on behalf of the user. The vulnerability falls under CWE\u201179 and allows an attacker to execute code in the context of other users without authentication when they access the preview.", "risk_and_exploitability": "The CVSS base score is 5.3, indicating a moderate severity level. EPSS information is unavailable, and the vulnerability is not listed in the KEV catalog. Exploitation requires the attacker to have permission to create a shared AI conversation, after which the attacker crafts a malicious title that is shared with victims. The risk is therefore moderate but tangible for sites that allow unrestricted shared conversation creation without additional controls."}}}}, "created": "2026-03-31T19:53:44.032234+00:00", "updated": "2026-03-31T20:37:41.060648+00:00", "vendors": ["discourse", "discourse$PRODUCT$discourse"]}