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CVE-2026-40300— Zulip: Message edit history visible in "moves only" policy through /api/v1/messages/{id}/history

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 12.0之前版本存在访问控制错误漏洞，该漏洞源于当message_edit_history_visibility_policy设置为moves时，/api/v1/messages/{id}/history仍返回历史内容值，可能导致低权限用户恢复其他用户消息中被编辑的文本。

AI Predicted 5.3 Difficulty: Easy EPSS 0.35% · P27

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
zulip zulip < 12.0 affected
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I. Basic Information for CVE-2026-40300

Vulnerability Information
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Vulnerability Title
Zulip: Message edit history visible in "moves only" policy through /api/v1/messages/{id}/history
Source: CVE Program / CVE List V5
Vulnerability Description
Zulip is an open-source team collaboration tool. Prior to 12.0, With message_edit_history_visibility_policy set to "moves", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages. This vulnerability is fixed in 12.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Zulip 访问控制错误漏洞
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 12.0之前版本存在访问控制错误漏洞，该漏洞源于当message_edit_history_visibility_policy设置为moves时，/api/v1/messages/{id}/history仍返回历史内容值，可能导致低权限用户恢复其他用户消息中被编辑的文本。
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

Vendor Product Affected Versions CPE Subscribe
zulip zulip < 12.0 -

II. Public POCs for CVE-2026-40300

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III. Intelligence Information for CVE-2026-40300

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Vendor Advisories for CVE-2026-40300 (1)

IV. Related Vulnerabilities

Same product: zulip
Same vendor: zulip
Same weakness: CWE-284

V. Comments for CVE-2026-40300

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