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.

Vulnerability/
CVE-2019-16216

medium

5.4

CWE

18/9/2019

5/8/2024

CVE-2019-16216: XSS

First published: Wed Sep 18 2019(Updated: )

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.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
Zulip Zulip Server	>=1.8.0<2.0.5

Remedy

https://github.com/zulip/zulip/commit/1195841dfb9aa26b3b0dabc6f05d72e4af25be3e

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Reference Links

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.

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