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Prior to 12.0, With message_edit_history_visibility_policy set to "moves", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages.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

PUBLISHED Reserved 2026-04-10 | Published 2026-05-12 | Updated 2026-05-13 | Assigner GitHub_M




MEDIUM: 6.0CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-284: Improper Access Control

Product status

< 12.0
affected

References

github.com/.../zulip/security/advisories/GHSA-jp8f-mvv6-89cr exploit

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

cve.org (CVE-2026-40300)

nvd.nist.gov (CVE-2026-40300)

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