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Vulnerability record · CVE-2026-25742 · published 3 April 2026

CVE-2026-25742: Zulip missing authorization vulnerability

Zulip · Zulip

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.

5.3 CVSS 3.1 Medium EPSS 0.45% · top 63.7% CWE-862 · Missing authorization
5.3CVSS 3.1 base score
0.45%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 2 tagged exploit
24 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236 Patch
https://github.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735bae Patch
https://github.com/zulip/zulip/releases/tag/11.6 Release Notes
https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w ExploitVendor Advisory
https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w ExploitVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-25742), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.