Medium 5.3Published Apr 3, 2026

CVE-2026-25742Zulip is an open-source team collaboration tool.

Updated under an hour ago (2026-10-19 07:23 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 5.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jul 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

zulip zulip zulip:zulip	from 1.4.0 before 11.6	NVD

References

https://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236patch
https://github.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735baepatch
https://github.com/zulip/zulip/releases/tag/11.6release-notes
https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28wexploit, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.