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.
References (2)
Core 2
Core References
Patch x_refsource_misc
https://github.com/zulip/zulip/commit/c6334a765b1e6d71760e4a3b32ae5b8367f2ed4d
Third Party Advisory x_refsource_confirm
https://github.com/zulip/zulip/security/advisories/GHSA-5xg8-xhfj-4hm6
Scores
CVSS v3
5.3
EPSS
0.0015
EPSS Percentile
34.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-200
Status
published
Products (1)
zulip/zulip_server
7.0 - 9.4
Published
Jan 16, 2025
Tracked Since
Feb 18, 2026