Vulnerability · Published Nov 4, 2026 · Assigned by GitHub_M

CVE-2026-115574Zulip: Custom profile fields can be read by logged-out visitors in organization with web-public channels

Medium 5.3

In plain English

A medium-severity missing authorization in zulip from zulip. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei.

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.7%top 46.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack tooling1Nuclei

Official description

Zulip 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.

Affected products (as reported)

Vendor	Product	Versions
zulip	zulip	>= 11.0, < 12.2

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

https://github.com/zulip/zulip/security/advisories/GHSA-3m37-hwq6-jrj8 x_refsource_CONFIRM
https://github.com/zulip/zulip/pull/39913 x_refsource_MISC
https://github.com/zulip/zulip/commit/6f33a8fa345ba776039a3f46131c253599a3ba15 x_refsource_MISC
https://github.com/zulip/zulip/commit/774d4c7b12755178fa406f0c0f3b2cafdbbec32c x_refsource_MISC
https://github.com/zulip/zulip/releases/tag/12.2 x_refsource_MISC
https://zulip.readthedocs.io/en/latest/overview/changelog.html#zulip-server-12-2 x_refsource_MISC