CVE-2026-25742

MEDIUM EPSS 22.9%
Published Apr 3, 20262mo ago · Modified Jun 17, 20262w ago
5.3 CVSS 3.1
Medium
Find Similar
Published Apr 3, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
5.3
Exploitability
3.9
Impact
1.4
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity None
Availability None

Threat Intelligence

EPSS Exploit Probability
22.9% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-862 Missing Authorization Authorization

Affected Products 1

VendorProductVersionRange
zulipzulip*≥1.4.0  –  <11.6

References 4

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

Remediation

  • github.com https://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236
    Patch
  • github.com https://github.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735bae
    Patch