CVEvulnerability
CVE-2026-100404
6.5 MEDIUM
Official page ↗
- Status
- Awaiting Analysis
- Published
- 2026-10-14
- Last modified
- 2026-10-29
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- CWE-862
Description
Zulip is an open-source team collaboration tool. In Zulip Server versions through 12.1, guest users can receive new message events for public channels outside their subscriptions. A guest can trigger the issue by registering an event queue with parameters that request messages from an unsubscribed public channel, or an existing event queue can remain affected after the guest's access to the channel is removed. The flaw discloses new public-channel messages to the guest. This issue is fixed in version 12.2.
Related
Weakness · CWE (1)
- CWE-862 Missing Authorization weakness
References
- https://github.com/zulip/zulip/commit/98659a41cb93d4ce329ea14bb0cdfb4b147500ba github.com
- https://github.com/zulip/zulip/commit/c03db8916456674df3c98614f6f0ef8cd024ef11 github.com
- https://github.com/zulip/zulip/pull/39913 github.com
- https://github.com/zulip/zulip/releases/tag/12.2 github.com
- https://github.com/zulip/zulip/security/advisories/GHSA-5r8f-gq2h-fcgp github.com