CVE-2019-16216
5.4 · MEDIUMOverview
CVE-2019-16216 is a medium-severity vulnerability affecting zulip zulip_server. It was published on September 18, 2019 and has a CVSS 3.1 base score of 5.4 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from zulip. Update zulip_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| zulip | zulip_server | >= 1.8.0, < 2.0.5 | Affected |
References
Frequently Asked Questions
What is CVE-2019-16216?
CVE-2019-16216 is a medium-severity vulnerability affecting zulip zulip_server. It was published on September 18, 2019 and has a CVSS 3.1 base score of 5.4 (MEDIUM).
How severe is CVE-2019-16216?
This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2019-16216?
Check the references section for vendor advisories and patches from zulip. Update zulip_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2019-16216?
CyberStrike's AI-powered security agents can automatically detect CVE-2019-16216 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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