Vulnerability · Published May 15, 2025 · Assigned by GitHub_M
CVE-2025-47930Zulip Server has access control bypass for restrictions on creation of specific channel types
Medium 5.3
In plain English
A medium-severity incorrect authorization in zulip from zulip. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).
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.
Affected products (as reported)
Weakness: CWE-863 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/zulip/zulip/security/advisories/GHSA-rqg7-xfqg-v7q5 x_refsource_CONFIRM
- https://github.com/zulip/zulip/commit/d2ff4bda4c3efa30fc3ab1f151255cfdbf370f78 x_refsource_MISC
- https://zulip.com/help/configure-who-can-create-channels x_refsource_MISC
- https://zulip.readthedocs.io/en/latest/overview/changelog.html#zulip-server-10-3 x_refsource_MISC