CVE-2026-40300— Zulip: Message edit history visible in "moves only" policy through /api/v1/messages/{id}/history
Possible ATT&CK Techniques 1AI
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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: NVD (National Vulnerability Database)
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Prior to 12.0, With message_edit_history_visibility_policy set to "moves", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages.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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
访问控制不恰当
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2026-40300
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- https://github.com/zulip/zulip/security/advisories/GHSA-jp8f-mvv6-89crx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2026-40300
IV. Related Vulnerabilities
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- CVE-2026-26058
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Zulip affected by Stored XSS in user profile modal - CVE-2025-52559
Zulip XSS in digest preview URL
Same vendor: zulip
- CVE-2026-26058
Zulip: Path Traversal in Import - CVE-2026-25742
Zulip: Anonymous File Access After Disabling Spectator Acces - 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-284
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Traefik: Gateway API TraefikService backend accepts rest@int - CVE-2025-0040
NXP JTAG-AXI访问控制漏洞
V. Comments for CVE-2026-40300
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