GHSA-2v3w-6g35-5f9v

Suggest an improvement
Source
https://github.com/advisories/GHSA-2v3w-6g35-5f9v
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-2v3w-6g35-5f9v/GHSA-2v3w-6g35-5f9v.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-2v3w-6g35-5f9v
Aliases
Published
2026-03-16T15:30:42Z
Modified
2026-03-26T21:11:24Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
Mattermost fails to properly validate User-Agent header tokens
Details

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly validate User-Agent header tokens which allows an authenticated attacker to cause a request panic via a specially crafted User-Agent header. Mattermost Advisory ID: MMSA-2026-00586

Database specific 
{
    "cwe_ids":  [
        "CWE-1287"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-03-17T19:59:39Z",
    "nvd_published_at":  "2026-03-16T14:18:23Z",
    "severity":  "MODERATE"
}
References

Affected packages

Go
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
8.0.0-20260129181235-1346cf529aef

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-2v3w-6g35-5f9v/GHSA-2v3w-6g35-5f9v.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
0 Unknown introduced version / All previous versions are affected
Fixed
5.3.2-0.20260129181235-1346cf529aef

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-2v3w-6g35-5f9v/GHSA-2v3w-6g35-5f9v.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-rc1
Fixed
10.11.11

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-2v3w-6g35-5f9v/GHSA-2v3w-6g35-5f9v.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
11.2.0-rc1
Fixed
11.2.3

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-2v3w-6g35-5f9v/GHSA-2v3w-6g35-5f9v.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
11.3.0-rc1
Fixed
11.3.1

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-2v3w-6g35-5f9v/GHSA-2v3w-6g35-5f9v.json"