CVE-2024-56136 /api/v1/jwt/fetch_api_key endpoint can leak if an email address has an account in Zulip server
Unauthenticated attackers can determine if an email address is registered on multi-organization Zulip servers, leaking user account existence.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2024-56136?
CVE-2024-56136 is a medium-severity vulnerability in zulip, published on 16 Jan 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Zulip server provides an open-source team chat that helps teams stay productive and focused. Zulip Server 7.0 and above are vulnerable to an information disclose attack, where, if a Zulip server is hosting multiple organizations, an unauthenticated user can make a request and determine if an email address is in use by a user. Zulip Server 9.4 resolves the issue, as does the `main` branch of Zulip Server. Users are advised to upgrade. There are no known workarounds for this issue.
Weakness: CWE-200
Which versions are affected by CVE-2024-56136?
It affects 1 product.
Products include Zulip Zulip Server.
How do I fix CVE-2024-56136?
No fix has been published for CVE-2024-56136 yet. Limit exposure of the affected software until one is available.
Is CVE-2024-56136 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-56136 exists.
Other vulnerabilities in zulip
- 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-5xg8-xhfj-4hm6.