Description
An issue was discovered in Zulip Server before 3.4. A bug in the implementation of the all_public_streams API feature resulted in guest users being able to receive message traffic to public streams that should have been only accessible to members of the organization.
References (1)
Core 1
Core References
Vendor Advisory x_refsource_misc
https://blog.zulip.com/2021/04/14/zulip-server-3-4/
Scores
CVSS v3
5.3
EPSS
0.0086
EPSS Percentile
53.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Details
CWE
CWE-269
Status
published
Products (1)
zulip/zulip_server
< 3.4
Published
Apr 15, 2021
Tracked Since
Feb 18, 2026