Description
WordPress Plugin Markdown on Save Improved is prone to a cross-site scripting vulnerability because it fails to properly sanitize user-supplied input. An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks. WordPress Plugin Markdown on Save Improved version 2.5 is vulnerable; prior versions may also be affected.
Remediation
Update to plugin version 2.5.1 or latest
References
http://jvndb.jvn.jp/en/contents/2016/JVNDB-2016-000071.html
https://wordpress.org/plugins/markdown-on-save-improved/changelog/
Related Vulnerabilities
WordPress 4.2.x Cross-Site Scripting Vulnerability (4.2 - 4.2.5)
WordPress Plugin Adblock Blocker Arbitrary File Upload (0.0.1)
WordPress Plugin Share Drafts Publicly Information Disclosure (1.1.4)
Dolibarr Unrestricted Upload of File with Dangerous Type Vulnerability (CVE-2020-14209)
GlassFish Use of Hard-coded Credentials Vulnerability (CVE-2018-14324)