CVE-2026-27769

low

Published 2026-04-17 · Modified 2026-04-28

CVSS v3

—

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

CVSS v2

—

VIR risk

2.5

Description

Mattermost doesn't validate whether users were correctly owned by the correct Connected Workspace

Predictions

Exploit likelihood

30%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No vendor mitigations ingested yet for this CVE. The mitigation-content worker queues fetches as references arrive — check back in a few minutes, or see the references list below.

Package impact

Ecosystem	Package	Vulnerable	Fixed
Go	github.com/mattermost/mattermost-server	`>=8.0.0-20250721062209-4952acea88ce,<8.0.0-20260316060126-bc1a2b34b1f9`	`8.0.0-20260316060126-bc1a2b34b1f9`
GO	github.com/mattermost/mattermost-server	`>= 8.0.0-20250721062209-4952acea88ce, < 8.0.0-20260316060126-bc1a2b34b1f9`	`8.0.0-20260316060126-bc1a2b34b1f9`

References

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