What’s Vulnerable › Vulnerabilities

CVE-2022-23656: Cross-site scripting vulnerability in Zulip Server

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-03-02 · updated 2026-06-17
• Weakness: CWE-79

Description

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: from 2021-06-03 before 2022-03-01 — fixed in 2022-03-01

How to fix

Upgrade to a fixed version: zulip 2022-03-01. Check the vendor advisory for mitigations.

References

• https://github.com/zulip/zulip/commit/e090027adcbf62737d5b1f83a9618a9500a49321
• https://github.com/zulip/zulip/security/advisories/GHSA-fc77-h3jc-6mfv
• https://github.com/zulip/zulip/commit/e090027adcbf62737d5b1f83a9618a9500a49321
• https://github.com/zulip/zulip/security/advisories/GHSA-fc77-h3jc-6mfv

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