GO-2026-5256

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Source

https://pkg.go.dev/vuln/GO-2026-5256

Import Source

https://vuln.go.dev/ID/GO-2026-5256.json

JSON Data

https://api.osv.dev/v1/vulns/GO-2026-5256

Aliases

Published

2026-06-25T18:43:15Z

Modified

2026-06-25T19:45:26Z

Summary

Mattermost does not verify remote cluster channel access when processing shared channel membership removals in github.com/mattermost/mattermost-server

Details

Mattermost does not verify remote cluster channel access when processing shared channel membership removals in github.com/mattermost/mattermost-server.

NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.

(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)

The additional affected modules and versions are: github.com/mattermost/mattermost-server/v5 before v5.3.2-0.20260216150504-8738f8c4b3d4.

Database specific

{
    "review_status": "UNREVIEWED",
    "url": "https://pkg.go.dev/vuln/GO-2026-5256"
}

References

Affected packages

github.com/mattermost/mattermost-server

Package

Name: github.com/mattermost/mattermost-server; View open source insights on deps.dev
Purl: pkg:golang/github.com/mattermost/mattermost-server

Affected ranges

Type: SEMVER
Events: Introduced

10.11.0+incompatible

Fixed

10.11.14+incompatible

Introduced

11.4.0+incompatible

Fixed

11.4.4+incompatible

Introduced

11.5.0+incompatible

Fixed

11.5.2+incompatible

Database specific

source

"https://vuln.go.dev/ID/GO-2026-5256.json"

github.com/mattermost/mattermost-server/v5

Package

Name: github.com/mattermost/mattermost-server/v5; View open source insights on deps.dev
Purl: pkg:golang/github.com/mattermost/mattermost-server/v5

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Ecosystem specific

{
    "custom_ranges": [
        {
            "events": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "5.3.2-0.20260216150504-8738f8c4b3d4"
                }
            ],
            "type": "ECOSYSTEM"
        }
    ]
}

Database specific

source

"https://vuln.go.dev/ID/GO-2026-5256.json"

github.com/mattermost/mattermost-server/v6

Package

Name: github.com/mattermost/mattermost-server/v6; View open source insights on deps.dev
Purl: pkg:golang/github.com/mattermost/mattermost-server/v6

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Database specific

source

"https://vuln.go.dev/ID/GO-2026-5256.json"

github.com/mattermost/mattermost/server/v8

Package

Name: github.com/mattermost/mattermost/server/v8; View open source insights on deps.dev
Purl: pkg:golang/github.com/mattermost/mattermost/server/v8

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

8.0.0-20260216150504-8738f8c4b3d4

Database specific

source

"https://vuln.go.dev/ID/GO-2026-5256.json"