Vulnerability Details CVE-2020-15139
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. 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.006
EPSS Ranking 67.5%
CVSS Severity
CVSS v3 Score 8.8
CVSS v2 Score 4.3
Products affected by CVE-2020-15139
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cpe:2.3:a:mybb:mybb:1.0.2
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cpe:2.3:a:mybb:mybb:1.1.0
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cpe:2.3:a:mybb:mybb:1.1.1
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cpe:2.3:a:mybb:mybb:1.1.2
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cpe:2.3:a:mybb:mybb:1.1.3
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cpe:2.3:a:mybb:mybb:1.1.4
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cpe:2.3:a:mybb:mybb:1.1.5
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cpe:2.3:a:mybb:mybb:1.1.6
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cpe:2.3:a:mybb:mybb:1.1.7
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cpe:2.3:a:mybb:mybb:1.1.8
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cpe:2.3:a:mybb:mybb:1.2.0
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cpe:2.3:a:mybb:mybb:1.2.1
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cpe:2.3:a:mybb:mybb:1.2.10
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cpe:2.3:a:mybb:mybb:1.2.11
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cpe:2.3:a:mybb:mybb:1.2.12
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cpe:2.3:a:mybb:mybb:1.2.13
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cpe:2.3:a:mybb:mybb:1.2.14
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cpe:2.3:a:mybb:mybb:1.2.2
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cpe:2.3:a:mybb:mybb:1.2.3
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cpe:2.3:a:mybb:mybb:1.2.4
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cpe:2.3:a:mybb:mybb:1.2.5
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cpe:2.3:a:mybb:mybb:1.2.6
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cpe:2.3:a:mybb:mybb:1.2.7
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cpe:2.3:a:mybb:mybb:1.2.8
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cpe:2.3:a:mybb:mybb:1.2.9
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cpe:2.3:a:mybb:mybb:1.4.0
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cpe:2.3:a:mybb:mybb:1.4.1
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cpe:2.3:a:mybb:mybb:1.4.10
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cpe:2.3:a:mybb:mybb:1.4.11
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cpe:2.3:a:mybb:mybb:1.4.12
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cpe:2.3:a:mybb:mybb:1.4.13
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cpe:2.3:a:mybb:mybb:1.4.14
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cpe:2.3:a:mybb:mybb:1.4.15
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cpe:2.3:a:mybb:mybb:1.4.16
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cpe:2.3:a:mybb:mybb:1.4.2
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cpe:2.3:a:mybb:mybb:1.4.3
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cpe:2.3:a:mybb:mybb:1.4.4
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cpe:2.3:a:mybb:mybb:1.4.5
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cpe:2.3:a:mybb:mybb:1.4.6
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cpe:2.3:a:mybb:mybb:1.4.7
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cpe:2.3:a:mybb:mybb:1.4.8
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cpe:2.3:a:mybb:mybb:1.4.9
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cpe:2.3:a:mybb:mybb:1.5.1
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cpe:2.3:a:mybb:mybb:1.5.2
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cpe:2.3:a:mybb:mybb:1.6.0
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cpe:2.3:a:mybb:mybb:1.6.1
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cpe:2.3:a:mybb:mybb:1.6.10
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cpe:2.3:a:mybb:mybb:1.6.11
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cpe:2.3:a:mybb:mybb:1.6.12
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cpe:2.3:a:mybb:mybb:1.6.13
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cpe:2.3:a:mybb:mybb:1.6.14
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cpe:2.3:a:mybb:mybb:1.6.15
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cpe:2.3:a:mybb:mybb:1.6.16
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cpe:2.3:a:mybb:mybb:1.6.17
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cpe:2.3:a:mybb:mybb:1.6.18
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cpe:2.3:a:mybb:mybb:1.6.2
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cpe:2.3:a:mybb:mybb:1.6.3
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cpe:2.3:a:mybb:mybb:1.6.4
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cpe:2.3:a:mybb:mybb:1.6.5
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cpe:2.3:a:mybb:mybb:1.6.6
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cpe:2.3:a:mybb:mybb:1.6.7
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cpe:2.3:a:mybb:mybb:1.6.8
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cpe:2.3:a:mybb:mybb:1.6.9
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cpe:2.3:a:mybb:mybb:1.8.0
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cpe:2.3:a:mybb:mybb:1.8.1
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cpe:2.3:a:mybb:mybb:1.8.10
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cpe:2.3:a:mybb:mybb:1.8.11
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cpe:2.3:a:mybb:mybb:1.8.12
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cpe:2.3:a:mybb:mybb:1.8.13
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cpe:2.3:a:mybb:mybb:1.8.14
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cpe:2.3:a:mybb:mybb:1.8.15
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cpe:2.3:a:mybb:mybb:1.8.16
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cpe:2.3:a:mybb:mybb:1.8.17
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cpe:2.3:a:mybb:mybb:1.8.18
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cpe:2.3:a:mybb:mybb:1.8.19
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cpe:2.3:a:mybb:mybb:1.8.2
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cpe:2.3:a:mybb:mybb:1.8.20
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cpe:2.3:a:mybb:mybb:1.8.21
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cpe:2.3:a:mybb:mybb:1.8.22
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cpe:2.3:a:mybb:mybb:1.8.23
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cpe:2.3:a:mybb:mybb:1.8.3
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cpe:2.3:a:mybb:mybb:1.8.4
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cpe:2.3:a:mybb:mybb:1.8.5
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cpe:2.3:a:mybb:mybb:1.8.6
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cpe:2.3:a:mybb:mybb:1.8.7
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cpe:2.3:a:mybb:mybb:1.8.8
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cpe:2.3:a:mybb:mybb:1.8.9