CVE-2026-100404

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.

• CWE-862

• https://github.com/zulip/zulip/commit/98659a41cb93d4ce329ea14bb0cdfb4b147500ba
• https://github.com/zulip/zulip/commit/c03db8916456674df3c98614f6f0ef8cd024ef11
• https://github.com/zulip/zulip/pull/39913
• https://github.com/zulip/zulip/releases/tag/12.2
• https://github.com/zulip/zulip/security/advisories/GHSA-5r8f-gq2h-fcgp

Published

Oct 14, 2026

Last Modified

Oct 29, 2026

Status

Awaiting Analysis

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