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Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')


Severity Medium
Score 4.3/10


TinyMCE is an open source rich text editor. A Cross-Site Scripting (XSS) vulnerability was discovered in TinyMCE's content loading and content inserting code. An SVG image could be loaded through an `object` or `embed` element and that image could potentially contain an XSS payload. This issue affects versions prior to 7.0.0. This vulnerability could be mitigated in versions 6.8.0 through 6.8.3 by changing the value for the `convert_unsafe_embeds` flag to `True`, instead of relying on it default `False` value. For 7.x versions, this flag is enabled by default for security reasons and does not require any additional changes.

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CWE-79 - Cross Site Scripting

Cross-Site Scripting, commonly referred to as XSS, is the most dominant class of vulnerabilities. It allows an attacker to inject malicious code into a pregnable web application and victimize its users. The exploitation of such a weakness can cause severe issues such as account takeover, and sensitive data exfiltration. Because of the prevalence of XSS vulnerabilities and their high rate of exploitation, it has remained in the OWASP top 10 vulnerabilities for years.

Advisory Timeline

  • Published