CVE-2022-23656: Zulip Server

Medium severity, CVSS 5.4. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Zulip Zulip Server: from 2021-06-03, before 2022-03-01 (fixed in 2022-03-01)

Published 2022-03-02. Last modified 2026-06-17.