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CVE-2024-56136

/api/v1/jwt/fetch_api_key endpoint can leak if an email address has an account in Zulip server

Published: Jan 16, 2025Updated: Sep 27, 2025 Sources: CVE List NVDCWE-200
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.5%
Top 58.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Zulip server provides an open-source team chat that helps teams stay productive and focused. Zulip Server 7.0 and above are vulnerable to an information disclose attack, where, if a Zulip server is hosting multiple organizations, an unauthenticated user can make a request and determine if an email address is in use by a user. Zulip Server 9.4 resolves the issue, as does the `main` branch of Zulip Server. Users are advised to upgrade. There are no known workarounds for this issue.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-200NVD-CWE-noinfo

Affected Products

zulip serverzulip
On-premWeb App
Enterprise Software / collaboration-groupware
zulipzulip
On-premWeb App
Enterprise Software / collaboration-groupware
zuliposs-projectEnterprise Softwareaka zulip

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://github.com/zulip/zulip/commit/c6334a765b1e6d71760e4a3b32ae5b8367f2ed4d
github.com
https://github.com/zulip/zulip/security/advisories/GHSA-5xg8-xhfj-4hm6
github.com

Timeline

Published
Jan 16, 2025
Last Updated
Sep 27, 2025

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