CVE-2026-20796

unknown

Published 2026-02-13 · Modified 2026-02-23

CVSS v3

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

CVSS v2

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VIR risk

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Description

Mattermost doesn't properly validate channel membership at the time of data retrieval 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	`>=10.11.0,<10.11.10`	`10.11.10`
Go	github.com/mattermost/mattermost-server	`>=10.11.0+incompatible,<10.11.10+incompatible`	`10.11.10+incompatible`

References

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