CVE-2026-25742

Name: CVE-2026-25742
Creator: NVD / NIST
Published: 2026-04-03T21:17:10.06+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.31%

Last modified Jun 17, 2026

CVE-2026-25742 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Zulip is an open-source team collaboration tool. Prior to version 11.6, Zulip is an open-source team collaboration tool. EPSS estimates a 0.31% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.31%

22.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-862

Affected Software

Vendor	Product	Versions
Zulip	Zulip	>= 1.4.0, < 11.6

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
https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28wExploit, Vendor Advisory

Timeline

Published: Apr 3, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-25742?

How severe is CVE-2026-25742?

CVE-2026-25742 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.

How do I fix CVE-2026-25742?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-25742?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST