CVE-2025-47930 Zulip Server has access control bypass for restrictions on creation of specific channel types

Medium 5.3 Published 15 May 2025 Updated 16 May 2025

Attackers can bypass channel creation restrictions by creating private channels and changing their privacy settings to public.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-47930?

CVE-2025-47930 is a medium-severity missing authorization vulnerability in zulip, published on 15 May 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-863

Which versions are affected by CVE-2025-47930?

It affects 1 product.

Products include Zulip Zulip.

How do I fix CVE-2025-47930?

No fix has been published for CVE-2025-47930 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2025-47930 being exploited?

There is no known exploitation of CVE-2025-47930 in the wild and no public exploit code.

Sources

Also known as GHSA-rqg7-xfqg-v7q5.