CVE-2019-20871

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "matchCriteriaId": "622E94AF-4BC7-42D4-B750-F72EECB98C8A", "versionEndExcluding": "4.10.8", "vulnerable": true}, {"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "matchCriteriaId": "93D446DC-CA4C-4C09-80DA-525D91E2EA36", "versionEndExcluding": "5.7.3", "versionStartIncluding": "5.7.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "matchCriteriaId": "243BABD9-CBA3-49EB-9F09-C9F1B98BF11C", "versionEndExcluding": "5.8.1", "versionStartIncluding": "5.8.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mattermost:mattermost_server:5.9.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "B769FC2A-E54F-4C2C-A42B-3FC78B90F4EE", "vulnerable": true}, {"criteria": "cpe:2.3:a:mattermost:mattermost_server:5.9.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "49479373-44B5-4CFF-9F92-44534F99CED6", "vulnerable": true}, {"criteria": "cpe:2.3:a:mattermost:mattermost_server:5.9.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "314EB74B-91A9-4D97-A97F-365E214BD105", "vulnerable": true}, {"criteria": "cpe:2.3:a:mattermost:mattermost_server:5.9.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "FF4140FA-6A46-4307-B78D-1A0A6C73B0A5", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An issue was discovered in Mattermost Server before 5.9.0, 5.8.1, 5.7.3, and 4.10.8. The Markdown library allows catastrophic backtracking."}, {"lang": "es", "value": "Se detect\u00f3 un problema en Mattermost Server versiones anteriores a 5.9.0, 5.8.1, 5.7.3 y 4.10.8. La biblioteca Markdown permite un retroceso (backtracking) catastr\u00f3fico"}], "id": "CVE-2019-20871", "lastModified": "2026-06-17T02:31:21.247", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2020-06-19T16:15:10.640", "references": [{"source": "cve@mitre.org", "tags": ["Vendor Advisory"], "url": "https://mattermost.com/security-updates/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://mattermost.com/security-updates/"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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