CVE-2026-40300CWE-284

Zulip: Message edit history visible in "moves only" policy through /api/v1/messages/{id}/history

Medium · published May 12, 2026

CVSS v4.0
6.0
EPSS
0%
Percentile
27.6
In the wild
Unconfirmed
What it is

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Prior to 12.0, With message_edit_history_visibility_policy set to "moves", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages.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

The record
Technical detail
CVSS v4.0
6.0 · MEDIUM
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
EPSS
0.00352 · 27.6th percentile
Weakness
CWE-284 · Improper Access Control
Published
2026-05-12T16:33Z
EPSS history
Timeline
  • 12 MAY 16:33Z
    Zulip: Message edit history visible in "moves only" policy through /api/v1/messages/{id}/history
    cvelistv5