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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| zulip | zulip | >= 11.0, < 12.2 | — |
Automated scanner template
A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.
- Zulip Server 11.0 - 12.1 - Unauthenticated Custom Profile Field Disclosure http/cves/2026/CVE-2026-115574.yaml
Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.
References
- https://github.com/zulip/zulip/security/advisories/GHSA-3m37-hwq6-jrj8
- https://github.com/zulip/zulip/pull/39913
- https://github.com/zulip/zulip/commit/6f33a8fa345ba776039a3f46131c253599a3ba15
- https://github.com/zulip/zulip/commit/774d4c7b12755178fa406f0c0f3b2cafdbbec32c
- https://github.com/zulip/zulip/releases/tag/12.2
- https://zulip.readthedocs.io/en/latest/overview/changelog.html#zulip-server-12-2