CVE-2025-47930: Zulip

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Zulip is an open-source team chat application. Starting in version 10.0 and prior to version 10.3, the "Who can create public channels" access control mechanism can be circumvented by creating a private or web-public channel, and then changing the channel privacy to public. A similar technique works for creating private channels without permission, though such a process requires either the API or modifying the HTML, as we do mark the "private" radio button as disabled in such cases. Version 10.3 contains a patch.

Affected products

• Zulip Zulip: from 10.0, before 10.3 (fixed in 10.3)

Published 2025-05-16. Last modified 2026-06-17.