CVE-2017-0881

MEDIUM

Zulip <1.4.3 - Privilege Escalation

Title source: llm

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)

[Third Party Advisory, Vendor Advisory] http://www.securityfocus.com/bid/97159

[Patch, Third Party Advisory] https://github.com/zulip/zulip/commit/7ecda1ac8e26d8fb3725e954b2dc4723dda2255f

View Patch ZIP pw:eip

[Patch, Release Notes, Third Party Advisory] https://groups.google.com/d/msg/zulip-announce/VyawgRuoY34/NTBwnTArGwAJ

Scores

CVSS v3 4.3

EPSS 0.0021

EPSS Percentile 42.6%

Attack Vector NETWORK

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Classification

CWE

CWE-200 CWE-863

Status published

Affected Products (2)

zulip/zulip_server < 1.4.3

n/a/Zulip Server Versions 1.4.2 and below < Zulip Server Versions 1.4.2 and below

Timeline

Published Mar 28, 2017

Tracked Since Feb 18, 2026