Description
An issue was discovered in Zulip Server before 3.4. A bug in the implementation of the can_forge_sender permission (previously is_api_super_user) resulted in users with this permission being able to send messages appearing as if sent by a system bot, including to other organizations hosted by the same Zulip installation.
References (1)
Core 1
Core References
Release Notes, Vendor Advisory x_refsource_misc
https://blog.zulip.com/2021/04/14/zulip-server-3-4/
Scores
CVSS v3
4.3
EPSS
0.0057
EPSS Percentile
43.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Details
CWE
CWE-269
Status
published
Products (1)
zulip/zulip_server
< 3.4
Published
Apr 15, 2021
Tracked Since
Feb 18, 2026