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    CVE-2026-40300

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Prior to 12.0, With message_edit_history_visibility_policy set to "moves", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages.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

    Published:May 12, 2026
    Last Modified:May 13, 2026
    EPS:May 12, 2026
    EPSS Score:0.00038
    CVSS Score:6.5

    Affected Products

    Vendor
    Zulip
    Product
    Zulip
    Vendor
    Zulip
    Product
    Zulip Server

    Exploits

    https://github.com/zulip/zulip/security/advisories/GHSA-jp8f-mvv6-89crhttps://github.com/zulip/zulip/security/advisories/GHSA-jp8f-mvv6-89cr

    Common Weakness Enumeration

    CWE-284 Improper Access Control

    Related CVEs

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High