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.

• CWE-79
• CWE-79

• https://github.com/mybb/mybb/commit/37ad29dcd25489a37bdd89ebac761f22492558b0Patch, Third Party Advisory
• https://github.com/mybb/mybb/security/advisories/GHSA-37h7-vfv6-f8rjPatch, Third Party Advisory
• https://mybb.com/versions/1.8.24/Patch, Vendor Advisory
• https://github.com/mybb/mybb/commit/37ad29dcd25489a37bdd89ebac761f22492558b0Patch, Third Party Advisory
• https://github.com/mybb/mybb/security/advisories/GHSA-37h7-vfv6-f8rjPatch, Third Party Advisory
• https://mybb.com/versions/1.8.24/Patch, Vendor Advisory

Published

Aug 10, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2020-15133In faye-websocket before version 0.11.0, there is a lack of …8.7
• CVE-2020-15134Faye before version 1.4.0, there is a lack of certification …8.7
• CVE-2020-15135save-server (npm package) before version 1.05 is affected by…7.6
• CVE-2020-15136In ectd before versions 3.4.10 and 3.3.23, gateway TLS authe…6.5
• CVE-2020-15137All versions of HoRNDIS are affected by an integer overflow …5.9
• CVE-2020-15138Prism is vulnerable to Cross-Site Scripting. The easing prev…7.5
• CVE-2020-1514<p>A cross-site-scripting (XSS) vulnerability exists when Mi…5.4
• CVE-2020-15140In Red Discord Bot before version 3.3.11, a RCE exploit has …9.6
• CVE-2020-15141In openapi-python-client before version 0.5.3, there is a pa…4.1
• CVE-2020-15142In openapi-python-client before version 0.5.3, clients gener…9
• CVE-2020-15143In SyliusResourceBundle before versions 1.3.14, 1.4.7, 1.5.2…8.8
• CVE-2020-15145In Composer-Setup for Windows before version 6.0.0, if the d…8.2