CVE-2026-25742
Zulip: Anonymous File Access After Disabling Spectator Access
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.
INFO
Published Date :
April 3, 2026, 9:17 p.m.
Last Modified :
April 13, 2026, 6:07 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Zulip to version 11.6 or later.
- Verify spectator access settings.
- Remove any residual public stream configurations.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-25742.
| URL | Resource |
|---|---|
| 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 | Exploit Vendor Advisory |
| https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-25742 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-25742
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-25742 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-25742 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 13, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:zulip:zulip:*:*:*:*:*:*:*:* versions from (including) 1.4.0 up to (excluding) 11.6 Added Reference Type GitHub, Inc.: https://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735bae Types: Patch Added Reference Type GitHub, Inc.: https://github.com/zulip/zulip/releases/tag/11.6 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w Types: Exploit, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 08, 2026
Action Type Old Value New Value Added Reference https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w -
New CVE Received by [email protected]
Apr. 03, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Added CWE CWE-862 Added Reference https://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236 Added Reference https://github.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735bae Added Reference https://github.com/zulip/zulip/releases/tag/11.6 Added Reference https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w