CVE-2026-33424

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{"affected": [{"affectedData": [{"product": "discourse", "vendor": "discourse", "versions": [{"status": "affected", "version": ">= 2026.1.0-latest, < 2026.1.2"}, {"status": "affected", "version": ">= 2026.2.0-latest, < 2026.2.1"}, {"status": "affected", "version": "= 2026.3.0-latest"}]}], "source": "security-advisories@github.com"}], "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, an attacker can grant access to a private message topic through invites even after they lose access to that PM. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available."}, {"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, un atacante puede otorgar acceso a un tema de mensaje privado a trav\u00e9s de invitaciones incluso despu\u00e9s de que pierda el acceso a ese MP. Las versiones 2026.3.0-latest.1, 2026.2.1 y 2026.1.2 contienen un parche. No se conocen soluciones alternativas disponibles."}], "id": "CVE-2026-33424", "lastModified": "2026-06-17T10:37:28.527", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "LOW", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:L", "version": "3.1"}, "exploitabilityScore": 0.4, "impactScore": 5.5, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33424", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-03-25T13:43:10.491986Z", "version": "2.0.3"}}]}, "published": "2026-03-21T00:16:26.853", "references": [{"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/discourse/discourse/security/advisories/GHSA-hgcp-p7hq-cwxw"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"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": "2026-03-24T21:31:49.836434+00:00", "value": {"mitigation_remediation": ["Upgrade Discourse to a patched release (2026.3.0\u2011latest.1, 2026.2.1, or 2026.1.2) to apply the fix."], "summary": {"action": "Patch", "impact": "Unauthorized private message access"}, "threat_synthesis": {"affected_systems": "The issue impacts the open\u2011source Discourse platform. Versions prior to 2026.3.0\u2011latest.1, 2026.2.1, and 2026.1.2 are vulnerable. The patch is included in those releases; all earlier releases within the same branches remain at risk.", "description_and_impact": "A vulnerability in the Discourse discussion platform allows a user whose access to a private message topic has been revoked to re\u2011gain access through invite links, exposing confidential conversations that should remain private. The weakness is a failure in authentication after a privilege change, formally identified as CWE\u2011863. Once the revoked user obtains or retains an invite URL, the system permits view or interaction with the hidden topic, constituting a confidentiality breach.", "risk_and_exploitability": "The CVSS score of 5.9 indicates moderate severity, while the EPSS score of less than 1% suggests a low likelihood of widespread exploitation. The vulnerability is not listed in CISA\u2019s Known Exploited Vulnerabilities catalog. Exploitation requires that the attacker possess an invitation link and keep it after their access has been revoked; using the link grants immediate read access to the private topic."}}}}, "created": "2026-03-23T09:51:50.444010+00:00", "updated": "2026-03-25T14:33:49.996755+00:00", "vendors": ["discourse", "discourse$PRODUCT$discourse"]}