CVE-2026-0999

unknown

Published 2026-02-16 · Modified 2026-02-23

💬 Discuss on Community ✚ Propose mitigation

CVSS v3

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

CVSS v4 NEW

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not yet in upstream

VIR risk

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Description

Mattermost fails to properly validate login method restrictions 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	`<8.0.0-20251212052346-61651b0df7ea`	`8.0.0-20251212052346-61651b0df7ea`
Go	github.com/mattermost/mattermost-server	`>=11.1.0`
Go	github.com/mattermost/mattermost-server	`>=10.11.0`
Go	github.com/mattermost/mattermost-server	`>=11.2.0`
Go	github.com/mattermost/mattermost-server	`<5.3.2-0.20251212052346-61651b0df7ea`	`5.3.2-0.20251212052346-61651b0df7ea`
Go	github.com/mattermost/mattermost-server
Go	github.com/mattermost/mattermost-server	`>=10.11.0+incompatible`
Go	github.com/mattermost/mattermost-server	`>=11.1.0+incompatible`
Go	github.com/mattermost/mattermost-server	`>=11.2.0+incompatible`
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.