CVE-2026-25742— Zulip: Anonymous File Access After Disabling Spectator Access
Quick assessment
Affected
zulip zulip
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Zulip是美国Zulip公司的一款功能强大的开源群聊应用程序。用于将实时聊天的即时性与线程对话的生产力优势相结合。 Zulip 1.4.0至11.6之前版本存在安全漏洞，该漏洞源于关闭公共访问后，来自公共流的附件和主题历史仍可匿名访问，可能导致信息泄露。
Possible ATT&CK Techniques 1 AI
T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-25742
Vulnerability Information
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Vulnerability Title
Zulip: Anonymous File Access After Disabling Spectator Access
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Zulip 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zulip是美国Zulip公司的一款功能强大的开源群聊应用程序。用于将实时聊天的即时性与线程对话的生产力优势相结合。 Zulip 1.4.0至11.6之前版本存在安全漏洞，该漏洞源于关闭公共访问后，来自公共流的附件和主题历史仍可匿名访问，可能导致信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-25742
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2026-25742 (2)
Vendor Advisories for CVE-2026-25742 (1)
IV. Related Vulnerabilities
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CVE-2026-40300
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CVE-2026-26058
Zulip: Path Traversal in Import -
CVE-2026-25741
Zulip Vulnerable to Modification of Payment Method (Stripe D -
CVE-2026-24050
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CVE-2025-52559
Zulip XSS in digest preview URL
Same vendor: zulip
-
CVE-2026-40300
Zulip: Message edit history visible in "moves only" policy t -
CVE-2026-26058
Zulip: Path Traversal in Import -
CVE-2026-25741
Zulip Vulnerable to Modification of Payment Method (Stripe D -
CVE-2026-24050
Zulip affected by Stored XSS in user profile modal -
CVE-2025-52559
Zulip XSS in digest preview URL
Same weakness: CWE-862
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V. Comments for CVE-2026-25742
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