SB2025051909 - Improper access control in Zulip Server
Published: May 19, 2025
Security Bulletin ID
SB2025051909
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper access control (CVE-ID: CVE-2025-47930)
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions on creation of specific channel types. A remote user can bypass the "Who can create public channels" access control mechanism.
Remediation
Install update from vendor's website.