Cross-site scripting in Zulip Server - CVE-2018-9999
Published: April 18, 2018 / Updated: May 17, 2018
Vulnerability identifier: #VU14655
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2018-9999
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Zulip
Affected software:
Zulip Server
Zulip Server
Detailed vulnerability description
Vulnerability allows a remote attacker to perform XSS attacks.
The vulnerability is caused by an input validation error related to user uploads and the (default) LOCAL_UPLOADS_DIR storage backend. A remote attacker can create a specially specially crafted web page, trick the victim intop opening it and execute arbitrary HTML and script code in victim's browser.
How to mitigate CVE-2018-9999
Install update from vendor's website.