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4.3

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 t...

CVE-2021-30478 · published 5 years ago
Summary

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 sa...

What to do
  • Update zulip zulip_server to version 3.4 or later.
Affected software
VendorProductAffected versions
zulip zulip_server < 3.4
cpe:2.3:a:zulip:zulip_server:*:*:*:*:*:*:*:*
Original advisory text
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 t...
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.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
4.3 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-269Improper Privilege Management
Timeline
Published15 Apr 2021
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-2021-30478 · NVD
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