What’s Vulnerable › Vulnerabilities

CVE-2021-30487

• Severity: low (CVSS 2.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-15 · updated 2026-06-17

Description

In the topic moving API in Zulip Server 3.x before 3.4, organization administrators were able to move messages to streams in other organizations hosted by the same Zulip installation.

Affected products

• zulip: from 3.0 before 3.4 — fixed in 3.4

How to fix

Upgrade to a fixed version: zulip 3.4. Check the vendor advisory for mitigations.

References

• https://blog.zulip.com/2021/04/14/zulip-server-3-4/
• https://blog.zulip.com/2021/04/14/zulip-server-3-4/

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