Description
An error in the implementation of an autosubscribe feature in the check_stream_exists route of the Zulip group chat application server before 1.4.3 allowed an authenticated user to subscribe to a private stream that should have required an invitation from an existing member to join. The issue affects all previously released versions of the Zulip server.
References (3)
Core 3
Core References
Third Party Advisory, Vendor Advisory vdb-entry
x_refsource_bid
http://www.securityfocus.com/bid/97159
Patch, Release Notes, Third Party Advisory x_refsource_misc
https://groups.google.com/d/msg/zulip-announce/VyawgRuoY34/NTBwnTArGwAJ
Patch, Third Party Advisory x_refsource_misc
https://github.com/zulip/zulip/commit/7ecda1ac8e26d8fb3725e954b2dc4723dda2255f
Scores
CVSS v3
4.3
EPSS
0.0021
EPSS Percentile
42.7%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Details
CWE
CWE-200
CWE-863
Status
published
Products (2)
n/a/Zulip Server Versions 1.4.2 and below
Zulip Server Versions 1.4.2 and below
zulip/zulip_server
< 1.4.3
Published
Mar 28, 2017
Tracked Since
Feb 18, 2026