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CVE-2023-33186— Cross-site scripting vulnerability in Zulip Server development branch via topic tooltip

Quick assessment

Affected
zulip zulip
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zulip是美国Zulip公司的一款功能强大的开源群聊应用程序。用于将实时聊天的即时性与线程对话的生产力优势相结合。 Zulip 7.0-beta1版本、7.0-beta2版本存在安全漏洞，该漏洞源于消息提要的工具提示存在问题，攻击者利用该漏洞可以进行跨站点脚本（XSS）攻击。

CVSS 8.2 · High EPSS 0.62% · P48
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I. Basic Information for CVE-2023-33186

Vulnerability Information
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Vulnerability Title
Cross-site scripting vulnerability in Zulip Server development branch via topic tooltip
Source: CVE Program / CVE List V5
Vulnerability Description
Zulip is an open-source team collaboration tool with unique topic-based threading that combines the best of email and chat to make remote work productive and delightful. The main development branch of Zulip Server from May 2, 2023 and later, including beta versions 7.0-beta1 and 7.0-beta2, is vulnerable to a cross-site scripting vulnerability in tooltips on the message feed. An attacker who can send messages could maliciously craft a topic for the message, such that a victim who hovers the tooltip for that topic in their message feed triggers execution of JavaScript code controlled by the attacker.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Zulip 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zulip是美国Zulip公司的一款功能强大的开源群聊应用程序。用于将实时聊天的即时性与线程对话的生产力优势相结合。 Zulip 7.0-beta1版本、7.0-beta2版本存在安全漏洞，该漏洞源于消息提要的工具提示存在问题，攻击者利用该漏洞可以进行跨站点脚本（XSS）攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zulip zulip >= 7.0-beta1, < 7.0-beta3 -

II. Public POCs for CVE-2023-33186

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III. Intelligence Information for CVE-2023-33186

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Patches & Fixes for CVE-2023-33186 (3)

Vendor Advisories for CVE-2023-33186 (1)

IV. Related Vulnerabilities

Same product: zulip
Same vendor: zulip
Same weakness: CWE-79

V. Comments for CVE-2023-33186

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