CVE-2026-6334

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-6334
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-6334.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-6334
Aliases
Published
2026-05-18T06:33:56.008Z
Modified
2026-07-08T08:13:52.333740618Z
Severity
  • 3.1 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:N CVSS Calculator
Summary
OAuth authorization code client binding not enforced during token redemption in Mattermost
Details

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to enforce client identity binding during the OAuth authorization code redemption flow which allows an authenticated OAuth client to redeem authorization codes issued to a different client via a crafted token exchange request.. Mattermost Advisory ID: MMSA-2026-00570

Database specific 
{
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "11.5.0"
                },
                {
                    "last_affected": "11.5.1"
                },
                {
                    "introduced": "10.11.0"
                },
                {
                    "last_affected": "10.11.13"
                }
            ]
        }
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6334.json",
    "cna_assigner": "Mattermost",
    "cwe_ids": [
        "CWE-305"
    ]
}
References

Affected packages

Git / github.com/mattermost/mattermost

Affected ranges

Type
GIT
Repo
https://github.com/mattermost/mattermost
Events
Introduced
5b955468ea1ea8b56c0fb10feb258a36a767d7bb
Fixed
b21ef302025ee100f04f358c16301dc75fea91d9
Introduced
9f2616376582893035a7e3cb38b0fab648bba4e8
Fixed
cc4ef6863ee114bc96be4e34478ec2f0db3eac4e
Database specific 
{
    "source": "CPE_RANGE",
    "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "10.11.0"
        },
        {
            "fixed": "10.11.14"
        },
        {
            "introduced": "11.5.0"
        },
        {
            "fixed": "11.5.2"
        }
    ]
}

Affected versions

@mattermost/client@10.*
@mattermost/client@10.11.0
@mattermost/types@10.*
@mattermost/types@10.11.0
mattermost-redux@10.*
mattermost-redux@10.11.0
v10.*
v10.11.0
v10.11.0-rc3
v10.11.1
v10.11.1-rc1
v10.11.10
v10.11.11
v10.11.11-rc1
v10.11.11-rc2
v10.11.12
v10.11.13
v10.11.13-rc1
v10.11.14-rc1
v10.11.2
v10.11.2-rc1
v10.11.2-rc2
v10.11.3
v10.11.4
v10.11.4-rc1
v10.11.4-rc2
v10.11.4-rc3
v10.11.5
v10.11.6
v10.11.7
v10.11.8
v10.11.9
v10.11.9-rc1
v11.*
v11.5.0
v11.5.1
v11.5.2-rc1
v11.5.2-rc2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-6334.json"