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CVE-2026-100404

6.5 · MEDIUM

Zulip is an open-source team collaboration tool.

Published Oct 14, 2026CWE-862EPSS 0.41%

Overview

CVE-2026-100404 is a medium-severity vulnerability. It was published on October 14, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/zulip/zulip/commit/98659a41cb93d4ce329ea14bb0cdfb4b147500baGitHubgithub.com/zulip/zulip/commit/c03db8916456674df3c98614f6f0ef8cd024ef11GitHubgithub.com/zulip/zulip/pull/39913GitHubgithub.com/zulip/zulip/releases/tag/12.2GitHubgithub.com/zulip/zulip/security/advisories/GHSA-5r8f-gq2h-fcgp

How CyberStrike helps

Frequently asked questions

What is CVE-2026-100404?

CVE-2026-100404 is a medium-severity vulnerability. It was published on October 14, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-100404?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-100404?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-100404?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-100404 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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