---
id: "CVE-2026-115574"
kind: "vulnerability"
aliases: ["CVE-2026-115574"]
title: "Zulip: logged-out visitors can read custom profile fields of all users"
severity: "medium"
cvss: 5.3
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["other", "self-hosted", "web-public-channels", "zulip"]
not_affected_if: ["no-web-public-channels", "version-12.2-or-later", "version-below-11.0"]
published_at: "2026-11-04T20:19:02+00:00"
first_seen_at: "2026-11-04T20:29:03+00:00"
updated_at: "2026-11-04T20:30:05+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-115574", "first_seen_at": "2026-11-04T20:29:03+00:00"}]
---

# Zulip: logged-out visitors can read custom profile fields of all users

From Zulip 11.0 up to 12.2, organizations with web-public channels let logged-out visitors call GET /json/users with include_custom_profile_fields=true and receive every user's custom profile field values. An attacker with no account can read that personal profile data.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the Zulip server version with `zulip-server --version` or the installed release; affected versions are 11.0 through 12.2 (before 12.2).
- Check whether web-public channels are enabled for the organization in the organization settings.
- Test whether `GET /json/users?include_custom_profile_fields=true` returns custom profile field values without logging in.

## Fix

- Zulip `12.2`

## Timeline

- 2026-11-04T20:29:03+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-115574

## Documents

- [advisory] Vendor advisory: github.com https://github.com/zulip/zulip/security/advisories/GHSA-3m37-hwq6-jrj8
- [fix] Patch: github.com https://github.com/zulip/zulip/commit/6f33a8fa345ba776039a3f46131c253599a3ba15
- [fix] Patch: github.com https://github.com/zulip/zulip/commit/774d4c7b12755178fa406f0c0f3b2cafdbbec32c
- [fix] Release notes: github.com https://github.com/zulip/zulip/releases/tag/12.2

## From the sources

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.

---

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