CVE-2025-12419

unknown

Published 2025-11-27 · Modified 2026-03-03

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CVSS v3

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

CVSS v4 NEW

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not yet in upstream

VIR risk

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Description

Mattermost fails to properly validate OAuth state tokens during OpenID Connect authentication in github.com/mattermost/mattermost-server

Predictions

Exploit likelihood

30%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Package impact

Ecosystem	Package	Vulnerable	Fixed
Go	github.com/mattermost/mattermost/server/v8	`<8.0.0-20251028000919-d3ed703dc833`	`8.0.0-20251028000919-d3ed703dc833`
Go	github.com/mattermost/mattermost-server	`>=10.12.0,<10.12.2`	`10.12.2`
Go	github.com/mattermost/mattermost-server	`>=10.11.0,<10.11.5`	`10.11.5`
Go	github.com/mattermost/mattermost-server	`>=10.5.0,<10.5.13`	`10.5.13`
Go	github.com/mattermost/mattermost-server	`>=11.0.0,<11.0.4`	`11.0.4`
Go	github.com/mattermost/mattermost-server
Go	github.com/mattermost/mattermost-server/v5
Go	github.com/mattermost/mattermost-server/v6

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

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