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CVE-2023-47642

Stream description leaks to ex-subscribers in Zulip

MEDIUM
4.3
CVSS Score
Published: November 16, 2023 at 09:41 PM UTC
Updated: June 17, 2026 at 06:33 AM UTC
2 products affected across 1 vendorZulip ServerZulip

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

Zulip is an open-source team collaboration tool. It was discovered by the Zulip development team that active users who had previously been subscribed to a stream incorrectly continued being able to use the Zulip API to access metadata for that stream. As a result, users who had been removed from a stream, but still had an account in the organization, could still view metadata for that stream (including the stream name, description, settings, and an email address used to send emails into the stream via the incoming email integration). This potentially allowed users to see changes to a stream’s metadata after they had lost access to the stream. This vulnerability has been addressed in version 7.5 and all users are advised to upgrade. There are no known workarounds for this issue.

Affected

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

Zulip Server· Zulip
95%
1.3.0 ≤ v < 7.5
Affected range stops below 7.5, so it looks safe — our inference, not a vendor statement
Zulip· Zulip
60%
v < 7.5
Affected range stops below 7.5, 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 (2)

x_refsource_MISCPatch
Source: [email protected]
https://github.com/zulip/zulip/commit/6336322d2f9bbccaacfc80cba83a3c62eefd5737
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://github.com/zulip/zulip/security/advisories/GHSA-c9wc-65fh-9x8p

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-200NVD-CWE-noinfo

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