CVE-2026-4265

unknown

Published 2026-03-16 · Modified 2026-03-23

CVSS v3

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

CVSS v2

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VIR risk

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Description

Mattermost fails to validate team-specific upload_file permissions 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 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	`<8.0.0-20260107144005-c7f6efdfb035`	`8.0.0-20260107144005-c7f6efdfb035`
Go	github.com/mattermost/mattermost-server	`<5.3.2-0.20260107144005-c7f6efdfb035`	`5.3.2-0.20260107144005-c7f6efdfb035`
Go	github.com/mattermost/mattermost-server	`>=10.11.0-rc1,<10.11.11`	`10.11.11`
Go	github.com/mattermost/mattermost-server	`>=11.2.0-rc1,<11.2.3`	`11.2.3`
Go	github.com/mattermost/mattermost-server	`>=11.3.0-rc1,<11.3.1`	`11.3.1`
Go	github.com/mattermost/mattermost-server	`>=11.3.0-rc1+incompatible,<11.3.1+incompatible`	`10.11.11+incompatible`
Go	github.com/mattermost/mattermost-server/v5
Go	github.com/mattermost/mattermost-server/v6

References

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