Zulip: Custom profile fields can be read by logged-out visitors in organization with web-public channels

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-115574
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-04 20:19:02 UTC
Updated2026-11-04 20:19:02 UTC
DescriptionZulip is an open-source team collaboration tool. From 11.0 until 12.2, organizations with web-public channels enabled exposed the GET /json/users endpoint to logged-out spectators, and a missing access-control check allowed include_custom_profile_fields=true to return every user's custom profile field values in addition to the documented limited directory data. This exposed those custom profile field values to unauthenticated visitors. This issue is fixed in version 12.2.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

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

Problem Types: CWE-862 | CWE-862 CWE-862: Missing Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Zulip Zulip affected >= 11.0, < 12.2 Not specified

References

ReferenceSourceLinkTags
github.com/zulip/zulip/commit/774d4c7b12755178fa406f0c0f3b2cafdbbec32c [email protected] github.com
github.com/zulip/zulip/releases/tag/12.2 [email protected] github.com
github.com/zulip/zulip/pull/39913 [email protected] github.com
github.com/zulip/zulip/security/advisories/GHSA-3m37-hwq6-jrj8 [email protected] github.com
github.com/zulip/zulip/commit/6f33a8fa345ba776039a3f46131c253599a3ba15 [email protected] github.com
zulip.readthedocs.io/en/latest/overview/changelog.html [email protected] zulip.readthedocs.io
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