CVE-2019-16216: XSS
Zulip server before 2.0.5 incompletely validated the MIME types of uploaded files. A user who is logged into the server could upload files of certain types to mount a stored cross-site scripting attack on other logged-in users. On a Zulip server using the default local uploads backend, the attack is only effective against browsers lacking support for Content-Security-Policy such as Internet Explorer 11. On a Zulip server using the S3 uploads backend, the attack is confined to the origin of the configured S3 uploads hostname and cannot reach the Zulip server itself.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is CVE-2019-16216?
CVE-2019-16216 refers to a vulnerability in the Zulip server before version 2.0.5 that incompletely validates the MIME types of uploaded files, allowing for a stored cross-site scripting attack.
How severe is CVE-2019-16216?
CVE-2019-16216 has a severity rating of 5.4, which is considered medium.
How does CVE-2019-16216 affect Zulip server?
CVE-2019-16216 affects Zulip server versions before 2.0.5 by allowing logged-in users to upload certain file types and mount a stored cross-site scripting attack on other logged-in users.
What is the fix for CVE-2019-16216?
To fix CVE-2019-16216, it is recommended to update the Zulip server to version 2.0.5 or later.
What is the CWE ID for CVE-2019-16216?
The CWE ID for CVE-2019-16216 is 79.