What’s Vulnerable › Vulnerabilities

CVE-2020-9443

• Severity: medium (CVSS 6.1 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: 2020-03-18 · updated 2026-06-17
• Weakness: CWE-79

Description

Zulip Desktop before 4.0.3 loaded untrusted content in an Electron webview with web security disabled, which can be exploited for XSS in a number of ways. This especially affects Zulip Desktop 2.3.82.

Affected products

• Zulipchat Zulip Desktop: before 4.0.3 — fixed in 4.0.3

How to fix

Upgrade to a fixed version: Zulipchat Zulip Desktop 4.0.3. Check the vendor advisory for mitigations.

References

• https://blog.zulip.org/2020/02/29/zulip-desktop-4-0-3-security-release/
• https://blog.zulip.org/2020/02/29/zulip-desktop-4-0-3-security-release/

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