Vulnerability Details 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Prior to 12.0, With message_edit_history_visibility_policy set to "moves", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages.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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 10.1%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-40300
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cpe:2.3:a:zulip:zulip_server:10.0