{"api_version":"1","generated_at":"2026-07-23T15:35:33+00:00","cve":"CVE-2020-15139","urls":{"html":"https://cve.report/CVE-2020-15139","api":"https://cve.report/api/cve/CVE-2020-15139.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2020-15139","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-15139"},"summary":{"title":"CVE-2020-15139","description":"In MyBB before version 1.8.24, the custom MyCode (BBCode) for the visual editor doesn't escape input properly when rendering HTML, resulting in a DOM-based XSS vulnerability. The weakness can be exploited by pointing a victim to a page where the visual editor is active (e.g. as a post or Private Message) and operates on a maliciously crafted MyCode message. This may occur on pages where message content is pre-filled using a GET/POST parameter, or on reply pages where a previously saved malicious message is quoted. 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After upgrading MyBB to 1.8.24, make sure to update the version attribute in the `codebuttons` template for non-default themes to serve the latest version of the patched `jscripts/bbcodes_sceditor.js` file."}]},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]}]},"references":{"reference_data":[{"name":"https://github.com/mybb/mybb/security/advisories/GHSA-37h7-vfv6-f8rj","refsource":"CONFIRM","url":"https://github.com/mybb/mybb/security/advisories/GHSA-37h7-vfv6-f8rj"},{"name":"https://github.com/mybb/mybb/commit/37ad29dcd25489a37bdd89ebac761f22492558b0","refsource":"MISC","url":"https://github.com/mybb/mybb/commit/37ad29dcd25489a37bdd89ebac761f22492558b0"},{"name":"https://mybb.com/versions/1.8.24/","refsource":"MISC","url":"https://mybb.com/versions/1.8.24/"}]},"source":{"advisory":"GHSA-37h7-vfv6-f8rj","discovery":"UNKNOWN"}},"nvd":{"publishedDate":"2020-08-10 22:15:00","lastModifiedDate":"2020-08-13 15:58:00","problem_types":["CWE-79"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM"},"exploitabilityScore":2.8,"impactScore":2.7},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:N/I:P/A:N","accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"PARTIAL","availabilityImpact":"NONE","baseScore":4.3},"severity":"MEDIUM","exploitabilityScore":8.6,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":true}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:*","versionEndExcluding":"1.8.24","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2020","CveId":"15139","Ordinal":"176518","Title":"CVE-2020-15139","CVE":"CVE-2020-15139","Year":"2020"},"notes":[{"CveYear":"2020","CveId":"15139","Ordinal":"1","NoteData":"In MyBB before version 1.8.24, the custom MyCode (BBCode) for the visual editor doesn't escape input properly when rendering HTML, resulting in a DOM-based XSS vulnerability. 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