Auth bypass in Zulip
CVE-2023-32678
Zulip is an open-source team collaboration tool with topic-based threading that combines email and chat. Users who used to be subscribed to a private stream and have been removed from it since retain the ability to edit messages/topics, move messages to other streams, and delete messages that they used to have access to, if other relevant organization permissions allow these actions. For example, a user may be able to edit or delete their old messages they posted in such a private stream. An administrator will be able to delete old messages (that they had access to) from the private stream. This issue was fixed in Zulip Server version 7.3.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (40.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Zulip — versions < 7.3
- Zulip Server
Weakness classification (CWE)
References
- github.com/zulip/zulip/security/advisories/GHSA-q3wg-jm9p-35fj (Third Party Advisory)
- zulip.readthedocs.io/en/latest/overview/changelog.html (Release Notes)
Frequently asked questions
- What is CVE-2023-32678?
- CVE-2023-32678 is a medium-severity vulnerability in Zulip, classified under Improper Authorization. CVSS score: 6.5/10. Published 2023-08-25.
- How severe is CVE-2023-32678?
- Medium severity. CVSS v3 base score is 6.5 out of 10.