CVE-2026-28219

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{"affected": [{"affectedData": [{"product": "discourse", "vendor": "discourse", "versions": [{"status": "affected", "version": "< 2025.12.2"}, {"status": "affected", "version": ">= 2026.1.0-latest, < 2026.1.1"}, {"status": "affected", "version": ">= 2026.2.0-latest, < 2026.2.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*", "matchCriteriaId": "452E5338-8153-4A3E-B634-CAE43E14B557", "versionEndExcluding": "2025.12.2", "vulnerable": true}, {"criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*", "matchCriteriaId": "1CAFCC9D-53D7-4017-85A5-EE6CA5A6A11C", "versionEndExcluding": "2026.1.1", "versionStartIncluding": "2026.1.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:discourse:discourse:2026.2.0:*:*:*:latest:*:*:*", "matchCriteriaId": "BB002FDC-BC71-4C46-8AAF-A34EC717E0E7", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, an improper authorization check in the topic management logic allows authenticated users to modify privileged attributes of their topics. By manipulating specific parameters in a PUT or POST request, a regular user can elevate a topic\u2019s status to a site-wide notice or banner, bypassing intended administrative restrictions. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. There are no practical workarounds to prevent this behavior other than applying the security patch. Administrators concerned about unauthorized promotions should audit recent changes to site banners and global notices until the fix is deployed."}, {"lang": "es", "value": "Discourse es una plataforma de discusi\u00f3n de c\u00f3digo abierto. Antes de las versiones 2025.12.2, 2026.1.1 y 2026.2.0, una verificaci\u00f3n de autorizaci\u00f3n incorrecta en la l\u00f3gica de gesti\u00f3n de temas permite a los usuarios autenticados modificar atributos privilegiados de sus temas. Al manipular par\u00e1metros espec\u00edficos en una solicitud PUT o POST, un usuario regular puede elevar el estado de un tema a un aviso o banner de todo el sitio, eludiendo las restricciones administrativas previstas. Las versiones 2025.12.2, 2026.1.1 y 2026.2.0 aplican un parche al problema. No existen soluciones alternativas pr\u00e1cticas para prevenir este comportamiento aparte de aplicar el parche de seguridad. Los administradores preocupados por las promociones no autorizadas deber\u00edan auditar los cambios recientes en los banners del sitio y los avisos globales hasta que se implemente la correcci\u00f3n."}], "id": "CVE-2026-28219", "lastModified": "2026-06-17T10:28:21.327", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 1.3, "baseSeverity": "LOW", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "UNREPORTED", "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:U/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-2026-28219", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-03T15:08:08.508877Z", "version": "2.0.3"}}]}, "published": "2026-02-26T22:20:49.767", "references": [{"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/discourse/discourse/security/advisories/GHSA-8v26-9f7h-jc8x"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-915"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2025.12.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2026.1.0-latest,2026.1.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2026.2.0-latest,2026.2.0)"}}], "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": "2026-04-16T16:01:16.121963+00:00", "value": {"mitigation_remediation": ["Upgrade to Discourse version 2025.12.2, 2026.1.1, or 2026.2.0, which contain the necessary authorization fix", "If an update cannot be performed immediately, remove or disable the ability for normal users to set topics as global banners by tightening role permissions or disabling the relevant feature flag until the patch is applied", "Review recent banner and global notice changes to identify any unauthorized modifications and revert or remediate them as necessary"], "summary": {"action": "Immediate Patch", "impact": "Privilege Escalation"}, "threat_synthesis": {"affected_systems": "Discourse, the open source discussion platform, is affected in all releases prior to 2025.12.2, 2026.1.1, and 2026.2.0. Users running any of these unpatched versions are vulnerable to the mass assignment exploitation described.", "description_and_impact": "An improper authorization check in the topic management logic of Discourse allows an authenticated user to alter privileged attributes of a topic. By crafting specific parameters in a PUT or POST request, a regular user can promote a topic to a site\u2011wide notice or banner, effectively bypassing administrative restrictions. This flaw represents a classic privilege escalation scenario, enabling a non\u2011admin to exercise capabilities reserved for site managers.", "risk_and_exploitability": "The CVSS score of 1.3 indicates a low severity rating, and the EPSS score of less than 1% suggests a very low probability of widespread exploitation. The vulnerability is not listed in the CISA KEV catalog, implying no known active exploitation at this time. Attackers need only authenticated access; the flaw can be triggered via standard HTTP topic update endpoints, and no additional prerequisites such as privileged network access are required. While the impact is confined to the user\u2019s own topics, the ability to create site\u2011wide banners can misrepresent official communications or obscure legitimate notices."}}}}, "created": "2026-02-27T09:04:06.892011+00:00", "updated": "2026-04-16T16:15:08.455029+00:00", "vendors": ["discourse", "discourse$PRODUCT$discourse"]}