CVE-2025-66556

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-66556", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2025-12-04T16:01:32.472Z", "datePublished": "2025-12-05T17:56:44.463Z", "dateUpdated": "2025-12-05T18:09:34.326Z"}, "containers": {"cna": {"title": "Nextcloud talk allows participants to blindly delete poll drafts of other users by ID", "problemTypes": [{"descriptions": [{"cweId": "CWE-639", "lang": "en", "description": "CWE-639: Authorization Bypass Through User-Controlled Key", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.5, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-pr9f-vqgg-m2jh", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-pr9f-vqgg-m2jh"}, {"name": "https://github.com/nextcloud/spreed/pull/15532", "tags": ["x_refsource_MISC"], "url": "https://github.com/nextcloud/spreed/pull/15532"}, {"name": "https://github.com/nextcloud/spreed/commit/bd68e80d1dea98d84c1d621c2c681238cf041725", "tags": ["x_refsource_MISC"], "url": "https://github.com/nextcloud/spreed/commit/bd68e80d1dea98d84c1d621c2c681238cf041725"}, {"name": "https://hackerone.com/reports/3247386", "tags": ["x_refsource_MISC"], "url": "https://hackerone.com/reports/3247386"}], "affected": [{"vendor": "nextcloud", "product": "security-advisories", "versions": [{"version": "< 20.1.8", "status": "affected"}, {"version": ">= 21.0.0-beta.1, < 21.1.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2025-12-05T17:56:44.463Z"}, "descriptions": [{"lang": "en", "value": "Nextcloud talk is a video & audio conferencing app for Nextcloud. Prior to 20.1.8 and 21.1.2, a participant with chat permissions was able to delete poll drafts of other participants within the conversation based on their numeric ID. This vulnerability is fixed in 20.1.8 and 21.1.2."}], "source": {"advisory": "GHSA-pr9f-vqgg-m2jh", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2025-12-05T18:08:50.955809Z", "id": "CVE-2025-66556", "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": "2025-12-05T18:09:34.326Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-66556", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2025-12-05T18:08:50.955809Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-12-05T18:09:05.662Z"}}], "cna": {"title": "Nextcloud talk allows participants to blindly delete poll drafts of other users by ID", "source": {"advisory": "GHSA-pr9f-vqgg-m2jh", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.5, "attackVector": "NETWORK", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}], "affected": [{"vendor": "nextcloud", "product": "security-advisories", "versions": [{"status": "affected", "version": "< 20.1.8"}, {"status": "affected", "version": ">= 21.0.0-beta.1, < 21.1.2"}]}], "references": [{"url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-pr9f-vqgg-m2jh", "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-pr9f-vqgg-m2jh", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/nextcloud/spreed/pull/15532", "name": "https://github.com/nextcloud/spreed/pull/15532", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/nextcloud/spreed/commit/bd68e80d1dea98d84c1d621c2c681238cf041725", "name": "https://github.com/nextcloud/spreed/commit/bd68e80d1dea98d84c1d621c2c681238cf041725", "tags": ["x_refsource_MISC"]}, {"url": "https://hackerone.com/reports/3247386", "name": "https://hackerone.com/reports/3247386", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Nextcloud talk is a video & audio conferencing app for Nextcloud. Prior to 20.1.8 and 21.1.2, a participant with chat permissions was able to delete poll drafts of other participants within the conversation based on their numeric ID. This vulnerability is fixed in 20.1.8 and 21.1.2."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-639", "description": "CWE-639: Authorization Bypass Through User-Controlled Key"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2025-12-05T17:56:44.463Z"}}}, "cveMetadata": {"cveId": "CVE-2025-66556", "state": "PUBLISHED", "dateUpdated": "2025-12-05T18:09:34.326Z", "dateReserved": "2025-12-04T16:01:32.472Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2025-12-05T17:56:44.463Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "security-advisories", "vendor": "nextcloud", "versions": [{"status": "affected", "version": "< 20.1.8"}, {"status": "affected", "version": ">= 21.0.0-beta.1, < 21.1.2"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:nextcloud:talk:*:*:*:*:*:*:*:*", "matchCriteriaId": "5D5909D1-F39C-4C41-906C-2D2A7C830F0A", "versionEndExcluding": "20.1.8", "versionStartIncluding": "20.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:nextcloud:talk:*:*:*:*:*:*:*:*", "matchCriteriaId": "D2E99EC0-4563-4497-A72C-52C97089F7E1", "versionEndExcluding": "21.1.2", "versionStartIncluding": "21.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Nextcloud talk is a video & audio conferencing app for Nextcloud. Prior to 20.1.8 and 21.1.2, a participant with chat permissions was able to delete poll drafts of other participants within the conversation based on their numeric ID. This vulnerability is fixed in 20.1.8 and 21.1.2."}, {"lang": "es", "value": "Nextcloud Talk es una aplicaci\u00f3n de videoconferencia y audio para?Nextcloud.?Versiones anteriores a?20.1.8?y?21.1.2, un participante con permisos de chat pod\u00eda eliminar borradores de encuestas de otros participantes dentro de la conversaci\u00f3n bas\u00e1ndose en su identificador num\u00e9rico.?Esta vulnerabilidad est\u00e1 corregida en?20.1.8?y?21.1.2."}], "id": "CVE-2025-66556", "lastModified": "2026-10-15T21:10:00.327", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.5, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}, {"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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-66556", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-12-05T18:08:50.955809Z", "version": "2.0.3"}}]}, "published": "2025-12-05T18:15:58.803", "references": [{"source": "security-advisories@github.com", "tags": ["Patch", "Vendor Advisory"], "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-pr9f-vqgg-m2jh"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/nextcloud/spreed/commit/bd68e80d1dea98d84c1d621c2c681238cf041725"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/nextcloud/spreed/pull/15532"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Vendor Advisory"], "url": "https://hackerone.com/reports/3247386"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-639"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"created": "2025-12-08T09:39:47.437029+00:00", "updated": "2025-12-08T09:39:47.437055+00:00", "vendors": ["nextcloud", "nextcloud$PRODUCT$talk"]}