CVE-2021-3866 Cross-site Scripting (XSS) - Stored in zulip/zulip
Stored XSS in Zulip allows attackers to inject malicious scripts, potentially leading to code execution or account takeover.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-3866?
CVE-2021-3866 is a medium-severity cross-site scripting vulnerability in zulip/zulip, published on 20 Jan 2022. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
Cross-site Scripting (XSS) - Stored in GitHub repository zulip/zulip more than and including 44f935695d452cc3fb16845a0c6af710438b153d and prior to 3eb2791c3e9695f7d37ffe84e0c2184fae665cb6.
Weakness: CWE-79
Which versions are affected by CVE-2021-3866?
It affects 1 product.
Products include Zulip Zulip.
How do I fix CVE-2021-3866?
No fix has been published for CVE-2021-3866 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-2021-3866 being exploited?
There is no known exploitation of CVE-2021-3866 in the wild and no public exploit code.
Other vulnerabilities in zulip/zulip
- CVE-2021-43799 RabbitMQ exposes ports with weak default secrets in Zulip Server
- CVE-2022-35962 Crafted link in Zulip message can cause disclosure of credentials
- CVE-2016-4427 Auth bypass in zulip
- CVE-2023-28623 Unauthorized user can register an account in specific configurations in Zulip
- CVE-2021-43791 Ineffective expiration validation for invitation links in Zulip
Sources
Also known as GHSA-c9g2-65fq-w8q5.