Auth bypass in Zulip
CVE-2025-47930
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (24.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Zulip — versions >= 10.0, < 10.3
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2025-47930?
- CVE-2025-47930 is a medium-severity vulnerability in Zulip, classified under Incorrect Authorization. CVSS score: 5.3/10. Published 2025-05-16.
- How severe is CVE-2025-47930?
- Medium severity. CVSS v3 base score is 5.3 out of 10.