CVE-2018-9999 Cross-site scripting in n/a
Cross-site scripting vulnerability in Zulip Server allows attackers to execute arbitrary scripts via user uploads, potentially leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2018-9999?
CVE-2018-9999 is a medium-severity cross-site scripting vulnerability in n/a, published on 18 Apr 2018. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
In Zulip Server versions before 1.7.2, there was an XSS issue with user uploads and the (default) LOCAL_UPLOADS_DIR storage backend.
Weakness: CWE-79
Which versions are affected by CVE-2018-9999?
It affects 1 product.
Products include Zulip Zulip Server.
How do I fix CVE-2018-9999?
No fix has been published for CVE-2018-9999 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2018-9999 being exploited?
There is no known exploitation of CVE-2018-9999 in the wild and no public exploit code.
Other vulnerabilities in n/a
- CVE-2019-18933 Information disclosure in n/a
- CVE-2020-15070 Code injection in n/a
- CVE-2017-0910 Missing authorization in Zulip Server
- CVE-2025-31478 Zulip Authentication Backend Configuration Bypass
- CVE-2023-33186 Cross-site scripting vulnerability in Zulip Server development branch via topic tooltip
Sources
Also known as GHSA-cg35-j5q6-x5vf.