GHSA-8qq9-cqj8-82w4

Source

https://github.com/advisories/GHSA-8qq9-cqj8-82w4

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-8qq9-cqj8-82w4/GHSA-8qq9-cqj8-82w4.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-8qq9-cqj8-82w4

Aliases

Published

2026-06-12T18:31:59Z

Modified

2026-08-26T01:21:46Z

Severity

7.6 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:L CVSS Calculator

Summary

Mattermost doesn't sanitize FileInfo.Name received from federated peers during shared channel file sync

Details

Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to sanitize FileInfo.Name received from federated peers during shared channel file sync, which allows an attacker who controls a federated server to write files to arbitrary locations within the target server's filestore via path traversal sequences in the filename field. Mattermost Advisory ID: MMSA-2026-00661

Database specific

{
    "cwe_ids":  [
        "CWE-22"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-08-24T21:45:51Z",
    "nvd_published_at":  "2026-06-12T17:16:27Z",
    "severity":  "HIGH"
}

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

11.6.0

Fixed

11.6.1

Affected versions

11.*

11.6.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-8qq9-cqj8-82w4/GHSA-8qq9-cqj8-82w4.json"

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

11.5.0

Fixed

11.5.5

Database specific

last_known_affected_version_range

"<= 11.5.4"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-8qq9-cqj8-82w4/GHSA-8qq9-cqj8-82w4.json"

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

Fixed

10.11.17

Database specific

last_known_affected_version_range

"<= 10.11.15"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-8qq9-cqj8-82w4/GHSA-8qq9-cqj8-82w4.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

8.0.0-20250731163400-5b955468ea1e

Fixed

8.0.0-20260423180926-c021eeaff8f0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-8qq9-cqj8-82w4/GHSA-8qq9-cqj8-82w4.json"