CVE-2021-30478

4.3 mediumEPSS 0.6%

Medium (4.3) in zulip zulip server. EPSS 0.6% chance of exploitation in the next 30 days.

An issue was discovered in Zulip Server before 3.4. A bug in the implementation of the can_forge_sender permission (previously is_api_super_user) resulted in users with this permission being able to send messages appearing as if sent by a system bot, including to other organizations hosted by the same Zulip installation.

Severity

CVSS 3.1

4.3 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS: 0.6% chance of exploitation in the next 30 days; higher than 47% of CVEs (scores of 2026-10-31)
CWE: CWE-269
Published: 2021-04-15
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

zulip:zulip_server

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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