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


Severity Medium
Score 5.4/10


An issue was discovered in EspoCRM before 5.6.9. Stored XSS was executed when a attacker sends an attachment to admin with malicious JavaScript in the filename. This JavaScript executed when an admin selects the particular file from the list of all attachments. The attacker could inject the JavaScript inside the filename and send it to users, thus helping him steal victims' cookies (hence compromising their accounts).

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  • NONE

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