XSS in Zulip
CVE-2022-23656
Zulip is an open source team chat app. The `main` development branch of Zulip Server from June 2021 and later is vulnerable to a cross-site scripting vulnerability on the recent topics page. An attacker could maliciously craft a full name for their account and send messages to a topic with several participants; a victim who then opens an overflow tooltip including this full name on the recent topics page could trigger execution of JavaScript code controlled by the attacker. Users running a Zulip server from the main branch should upgrade from main (2022-03-01 or later) again to deploy this fix.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.006 (45.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Zulip — versions >= 2021-06-03, < 2022-03-01
- Zulip Server
Weakness classification (CWE)
References
- github.com/zulip/zulip/security/advisories/GHSA-fc77-h3jc-6mfv (Third Party Advisory)
- github.com/zulip/zulip/commit/e090027adcbf62737d5b1f83a9618a9500a49321 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2022-23656?
- CVE-2022-23656 is a medium-severity vulnerability in Zulip, classified under Cross-site Scripting. CVSS score: 4.6/10. Published 2022-03-02.
- How severe is CVE-2022-23656?
- Medium severity. CVSS v3 base score is 4.6 out of 10.