CVE-2023-33186 Cross-site scripting vulnerability in Zulip Server development branch via topic tooltip
An attacker can execute arbitrary JavaScript in a victim's browser by crafting a malicious message topic that triggers XSS via tooltip hover.
- 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-2023-33186?
CVE-2023-33186 is a high-severity cross-site scripting vulnerability in zulip, published on 30 May 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Zulip is an open-source team collaboration tool with unique topic-based threading that combines the best of email and chat to make remote work productive and delightful. The main development branch of Zulip Server from May 2, 2023 and later, including beta versions 7.0-beta1 and 7.0-beta2, is vulnerable to a cross-site scripting vulnerability in tooltips on the message feed. An attacker who can send messages could maliciously craft a topic for the message, such that a victim who hovers the tooltip for that topic in their message feed triggers execution of JavaScript code controlled by the attacker.
Weakness: CWE-79
Which versions are affected by CVE-2023-33186?
It affects 1 product.
Products include Zulip Zulip Server.
How do I fix CVE-2023-33186?
No fix has been published for CVE-2023-33186 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-2023-33186 being exploited?
There is no known exploitation of CVE-2023-33186 in the wild and no public exploit code.
Other vulnerabilities in zulip
Sources
Also known as GHSA-4r83-8f94-hrph.