Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Zulip | Zulip Server | >= 1.8.0, < 2.0.5 |
Related Weaknesses (CWE)
References
- https://blog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/Vendor Advisory
- https://github.com/zulip/zulip/commit/1195841dfb9aa26b3b0dabc6f05d72e4af25be3ePatchThird Party Advisory
- https://blog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/Vendor Advisory
- https://github.com/zulip/zulip/commit/1195841dfb9aa26b3b0dabc6f05d72e4af25be3ePatchThird Party Advisory
FAQ
What is CVE-2019-16216?
CVE-2019-16216 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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 attac...
How severe is CVE-2019-16216?
CVE-2019-16216 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-16216?
Check the references section above for vendor advisories and patch information. Affected products include: Zulip Zulip Server.