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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2019-09-18T11:08:09

Updated: 2024-08-05T01:10:41.549Z

Reserved: 2019-09-11T00:00:00

Link: CVE-2019-16216

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2019-09-18T12:15:10.990

Modified: 2019-09-18T18:43:07.133

Link: CVE-2019-16216

cve-icon Redhat

No data.