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CVE-2021-30478

MEDIUM
4.3
CVSS Score
Published: April 14, 2021 at 11:47 PM UTC
Updated: June 17, 2026 at 03:50 AM UTC
1 product affected across 1 vendorZulip Server

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.6%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Zulip Server· Zulip
95%
v < 3.4
Affected range stops below 3.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://blog.zulip.com/2021/04/14/zulip-server-3-4/

CVSS

4.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-269

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