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Prior to 12.0, With message_edit_history_visibility_policy set to "moves", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages.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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
zulip zulip affected
Version Status Constraints
< 12.0 affected —

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Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/zulip/zulip/security/advisories/GHSA-jp8f-mvv6-89cr cve-icon cve-icon
History

Tue, 12 May 2026 16:45:00 +0000

Type Values Removed Values Added
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Prior to 12.0, With message_edit_history_visibility_policy set to "moves", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages.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.
Title Zulip: Message edit history visible in "moves only" policy through /api/v1/messages/{id}/history
Weaknesses CWE-284
References
Metrics cvssV4_0

{'score': 6, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-12T16:33:02.829Z

Reserved: 2026-04-10T20:22:44.035Z

Link: CVE-2026-40300

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-12T17:16:20.150

Modified: 2026-05-12T17:16:20.150

Link: CVE-2026-40300

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses