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CVE-2026-25742

5.3 · MEDIUM

Zulip is an open-source team collaboration tool.

Published Apr 3, 2026CWE-862EPSS 0.45%

Overview

CVE-2026-25742 is a medium-severity vulnerability. It was published on April 3, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Zulip is an open-source team collaboration tool. Prior to version 11.6, Zulip is an open-source team collaboration tool. From version 1.4.0 to before version 11.6, even after spectator access (enable_spectator_access / WEB_PUBLIC_STREAMS_ENABLED) is disabled, attachments originating from web-public streams can still be retrieved anonymously. As a result, file contents remain accessible even after public access is intended to be disabled. Similarly, even after spectator access is disabled, the /users/me/<stream_id>/topics endpoint remains reachable anonymously, allowing retrieval of topic history for web-public streams. This issue has been patched in version 11.6. This issue has been patched in version 11.6.

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/3c045414299680b9f5dca7d76cf6cef6121c0236GitHubgithub.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735baeGitHubgithub.com/zulip/zulip/releases/tag/11.6GitHubgithub.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28wGitHubgithub.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w

How CyberStrike helps

Frequently asked questions

What is CVE-2026-25742?

CVE-2026-25742 is a medium-severity vulnerability. It was published on April 3, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-25742?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-25742?

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-2026-25742?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-25742 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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