CVE-2026-32243

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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."}, {"lang": "es", "value": "Discourse es una plataforma de discusi\u00f3n de c\u00f3digo abierto. Desde las versiones 2026.1.0-m\u00e1s reciente hasta antes de la 2026.1.3, 2026.2.0-m\u00e1s reciente hasta antes de la 2026.2.2, y 2026.3.0-m\u00e1s reciente hasta antes de la 2026.3.0, un atacante con la capacidad de crear conversaciones de IA compartidas podr\u00eda inyectar HTML y JavaScript arbitrarios a trav\u00e9s de t\u00edtulos de conversaci\u00f3n manipulados. Esta carga \u00fatil se ejecutar\u00eda en el navegador de cualquier usuario que viera la vista previa de onebox, lo que podr\u00eda permitir el secuestro de sesi\u00f3n o acciones no autorizadas en nombre de la v\u00edctima. Este problema ha sido parcheado en las versiones 2026.1.3, 2026.2.2 y 2026.3.0."}], "id": "CVE-2026-32243", "lastModified": "2026-07-24T20:10:00.147", "metrics": {"cvssMetricV31": [{"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"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-32243", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-03T16:17:35.426416Z", "version": "2.0.3"}}]}, "published": "2026-03-31T18:16:49.740", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/discourse/discourse/commit/cac7d618a562ce934f8dbf73cdb70066a4806b4c"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/discourse/discourse/security/advisories/GHSA-pjc5-8x3w-rfwx"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"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": "2026-04-09T21:00:29.077589+00:00", "value": {"mitigation_remediation": ["Upgrade to Discourse\u202f2026.1.3,\u202f2026.2.2, or\u202f2026.3.0 or later", "Disable the shared AI conversation feature if an upgrade is not feasible", "Sanitize or escape all shared conversation titles to prevent script injection"], "summary": {"action": "Patch Immediately", "impact": "Stored XSS"}, "threat_synthesis": {"affected_systems": "Discourse, the open-source discussion platform, is affected. Versions from 2026.1.0 up to but not including 2026.1.3, from 2026.2.0 up to but not including 2026.2.2, and from 2026.3.0 up to but not including 2026.3.0 contain the flaw; the issue was fixed in 2026.1.3, 2026.2.2, and 2026.3.0 respectively.", "description_and_impact": "The vulnerability allows an attacker to inject arbitrary HTML and JavaScript into the title of a shared AI conversation in Discourse, leading to stored client-side script execution when other users view the onebox preview. By executing malicious code in the victim\u2019s browser, an attacker could hijack sessions or perform unauthorized actions on behalf of the viewer. The weakness is a classic stored cross-site scripting flaw identified as CWE-79.", "risk_and_exploitability": "The CVSS base score is 5.3, indicating a medium severity. The EPSS probability is less than 1\u202f%, suggesting a low likelihood of current exploitation. The vulnerability is not listed in the CISA KEV catalog. Attackers would need the ability to create and share AI conversations, so the threat is limited to users with that permission. Once an attacker supplies a malicious conversation title, the payload executes in every browser that renders the onebox, giving attackers a client-side attack surface."}}}}, "created": "2026-03-31T19:53:44.032234+00:00", "updated": "2026-04-10T09:46:11.101750+00:00", "vendors": ["discourse", "discourse$PRODUCT$discourse"]}