CVE-2023-32678

Zulip vulnerable to insufficient authorization check for edition/deletion of messages and topics in private streams by former subscribers

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

Zulip is an open-source team collaboration tool with topic-based threading that combines email and chat. Users who used to be subscribed to a private stream and have been removed from it since retain the ability to edit messages/topics, move messages to other streams, and delete messages that they used to have access to, if other relevant organization permissions allow these actions. For example, a user may be able to edit or delete their old messages they posted in such a private stream. An administrator will be able to delete old messages (that they had access to) from the private stream. This issue was fixed in Zulip Server version 7.3.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

None

Integrity

Complete

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2023-05-11 CVE Reserved
2023-08-25 CVE Published
2024-09-30 CVE Updated
2025-04-15 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-285: Improper Authorization

CAPEC

References (2)

URL	Tag	Source
https://github.com/zulip/zulip/security/advisories/GHSA-q3wg-jm9p-35fj	Third Party Advisory
https://zulip.readthedocs.io/en/latest/overview/changelog.html#zulip-server-7-3	Release Notes

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Zulip Search vendor "Zulip"		Zulip Server Search vendor "Zulip" for product "Zulip Server"				< 7.3 Search vendor "Zulip" for product "Zulip Server" and version " < 7.3"		-		Affected