VIR Vulnerability Intelligence Relay

CVE-2026-40300

medium
Published 2026-05-12 · Modified 2026-05-13
CVSS v3
6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v2
—
VIR risk
6.5

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Prior to 12.0, With message_edit_history_visibility_policy set to "moves", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages.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

Predictions

Exploit likelihood
75%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: security-advisories@github.com — https://github.com/zulip/zulip/security/advisories/GHSA-jp8f-mvv6-89cr

Application impact
VendorProductVersionsFixed
zulipzulip_server10.0

References

CWEs

CWE-284

Verify integrity in audit chain (admin only). AS-IS.