CVE-2026-3590

medium

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

CVSS v3

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

CVSS v2

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VIR risk

5.5

Description

Mattermost has session spoofing due to lack of single-use consumption of guest magic link tokens enforcement

Predictions

Exploit likelihood

30%

Patch ETA

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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/v8	`>=8.0.0-20250721062209-4952acea88ce,<8.0.0-20250723052842-4cb8d8940332`	`8.0.0-20250723052842-4cb8d8940332`
Go	github.com/mattermost/mattermost-server	`>=10.11.0-rc1,<10.11.13`	`10.11.13`
Go	github.com/mattermost/mattermost-server	`>=11.5.0-rc1,<11.5.0`	`11.5.0`
Go	github.com/mattermost/mattermost-server	`>=11.4.0-rc1,<11.4.3`	`11.4.3`
Go	github.com/mattermost/mattermost-server	`>=11.3.0-rc1,<11.3.3`	`11.3.3`
GO	github.com/mattermost/mattermost-server	`>= 11.3.0-rc1, < 11.3.3`	`11.3.3`
GO	github.com/mattermost/mattermost-server	`>= 11.4.0-rc1, < 11.4.3`	`11.4.3`
GO	github.com/mattermost/mattermost-server	`= 11.5.0-rc1`	`11.5.0`
GO	github.com/mattermost/mattermost-server	`>= 10.11.0-rc1, < 10.11.13`	`10.11.13`
GO	github.com/mattermost/mattermost/server/v8	`>= 8.0.0-20250721062209-4952acea88ce, < 8.0.0-20250723052842-4cb8d8940332`	`8.0.0-20250723052842-4cb8d8940332`

References

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