CVE-2026-27467

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{"affected": [{"affectedData": [{"product": "bigbluebutton", "vendor": "bigbluebutton", "versions": [{"status": "affected", "version": "< 3.0.20"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:bigbluebutton:bigbluebutton:*:*:*:*:*:*:*:*", "matchCriteriaId": "FC6C16D8-2543-43E9-8F1B-632501E23028", "versionEndExcluding": "3.0.20", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "BigBlueButton is an open-source virtual classroom. In versions 3.0.19 and below, when first joining a session with the microphone muted, the client sends audio to the server regardless of mute state. Media is discarded at the server side, so it isn't audible to any participants, but this may allow for malicious server operators to access audio data. The behavior is only incorrect between joining the meeting and the first time the user unmutes. This issue has been fixed in version 3.0.20."}, {"lang": "es", "value": "BigBlueButton es un aula virtual de c\u00f3digo abierto. En las versiones 3.0.19 e inferiores, al unirse por primera vez a una sesi\u00f3n con el micr\u00f3fono silenciado, el cliente env\u00eda audio al servidor independientemente del estado de silencio. Los medios se descartan en el lado del servidor, por lo que no es audible para ning\u00fan participante, pero esto puede permitir a operadores de servidor maliciosos acceder a datos de audio. El comportamiento solo es incorrecto entre unirse a la reuni\u00f3n y la primera vez que el usuario quita el silencio. Este problema ha sido solucionado en la versi\u00f3n 3.0.20."}], "id": "CVE-2026-27467", "lastModified": "2026-06-17T10:27:12.047", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 2.0, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 0.5, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 2.4, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 0.9, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-27467", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-02-24T18:48:55.387593Z", "version": "2.0.3"}}]}, "published": "2026-02-21T08:16:11.827", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/bigbluebutton/bigbluebutton/commit/3aa47832bc2b17178799bd932453c226e8f95703"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Vendor Advisory"], "url": "https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-6gj9-5rhm-68j8"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.0.20)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "bigbluebutton", "source": "cna", "vendor": "bigbluebutton"}, "product": "bigbluebutton", "vendor": "bigbluebutton"}], "analysis": {"en": {"generated_at": "2026-04-18T11:20:13.931966+00:00", "value": {"mitigation_remediation": ["Apply the BigBlueButton patch v3.0.20 or later to eliminate the leak of muted participant audio.", "Implement strict access controls on the BigBlueButton server, ensuring only authorized administrators can manage the deployment and modify configuration, to mitigate potential malicious data capture.", "Enable logging and monitoring for audio streams and network traffic, and review logs for anomalous activity, to detect unauthorized capture of muted participant audio."], "summary": {"action": "Update", "impact": "Information Exposure"}, "threat_synthesis": {"affected_systems": "The affected product is BigBlueButton, version 3.0.19 or earlier. The issue was identified in the source code at the commit referenced in the advisory and was fixed in BigBlueButton v3.0.20, as noted in the official security advisory.", "description_and_impact": "BigBlueButton is an open\u2011source virtual classroom platform. In versions 3.0.19 and earlier, when a participant joins a meeting with the microphone muted, the client erroneously continues to transmit audio to the server until the participant unmutes. The server discards the received media, so it is not played to other attendees, but a malicious or compromised server may capture and analyze the audio stream. The primary consequence is the potential exposure of private conversation data to anyone controlling or observing the server environment. This vulnerability is classified as CWE\u2011200, an information exposure weakness.", "risk_and_exploitability": "The vulnerability carries a low CVSS score of 2 and an EPSS below 1\u202f%, indicating a small probability of exploitation under current conditions. It is not present in the CISA KEV catalog, further suggesting limited exposure. Exploitation requires a malicious or compromised server operator; remote attackers cannot capture audio from a muted participant without controlling the server. Consequently, the risk is confined to compromised server administrators or attackers who have remote control of a BigBlueButton deployment."}}}}, "created": "2026-02-23T14:32:23.688745+00:00", "updated": "2026-04-18T11:30:44.310755+00:00", "vendors": ["bigbluebutton", "bigbluebutton$PRODUCT$bigbluebutton"]}