CVE-2025-12421

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2025-12421
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-12421.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-12421
Aliases
Downstream
Related
Published
2025-11-27T17:47:04.944Z
Modified
2026-07-08T07:03:34.675947294Z
Severity
  • 9.9 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
Summary
Account Takeover via Code Exchange Endpoint
Details

Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to to verify that the token used during the code exchange originates from the same authentication flow, which allows an authenticated user to perform account takeover via a specially crafted email address used when switching authentication methods and sending a request to the /users/login/sso/code-exchange endpoint. The vulnerability requires ExperimentalEnableAuthenticationTransfer to be enabled (default: enabled) and RequireEmailVerification to be disabled (default: disabled).

Database specific 
{
    "cna_assigner": "Mattermost",
    "cwe_ids": [
        "CWE-303"
    ],
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "11.0.0"
                },
                {
                    "last_affected": "11.0.2"
                },
                {
                    "introduced": "10.12.0"
                },
                {
                    "last_affected": "10.12.1"
                },
                {
                    "introduced": "10.11.0"
                },
                {
                    "last_affected": "10.11.4"
                },
                {
                    "introduced": "10.5.0"
                },
                {
                    "last_affected": "10.5.12"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/12xxx/CVE-2025-12421.json"
}
References

Affected packages

Git / github.com/mattermost/mattermost

Affected ranges

Type
GIT
Repo
https://github.com/mattermost/mattermost
Events
Introduced
58bd34fd34cbd7d3da777d627b6cffdf8a532930
Fixed
288281e8cbf15260ad074b883a263b796cdb3e28
Introduced
5b955468ea1ea8b56c0fb10feb258a36a767d7bb
Fixed
46b5c436bb3093cc1da3fa2455f93d4c52389eee
Introduced
ba3dc1612ce8f37bf9814b1ea6364181fb5abd62
Fixed
364c2203de00fe0d8424b6b46d6f0eeb02a2539a
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
feb598ed2b7ac3cb78a253b032ad7e4628b0de00
Database specific 
{
    "extracted_events": [
        {
            "introduced": "10.5.0"
        },
        {
            "fixed": "10.5.13"
        },
        {
            "introduced": "10.11.0"
        },
        {
            "fixed": "10.11.5"
        },
        {
            "introduced": "10.12.0"
        },
        {
            "fixed": "10.12.2"
        },
        {
            "introduced": "11.0.0"
        },
        {
            "fixed": "11.0.3"
        }
    ],
    "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
    "source": "CPE_RANGE"
}

Affected versions

@mattermost/client@10.*
@mattermost/client@10.11.0
@mattermost/client@10.12.0
@mattermost/client@10.5.0
@mattermost/types@10.*
@mattermost/types@10.11.0
@mattermost/types@10.12.0
@mattermost/types@10.5.0
Other
cloud-2022-07-20-1
cloud-2022-08-10-1
cloud-2022-09-08-1
cloud-2022-10-06-1
cloud-2022-11-11-1
cloud-2022-11-24-1
mattermost-redux@10.*
mattermost-redux@10.11.0
mattermost-redux@10.12.0
preview-v0.*
preview-v0.1
server/public/v0.*
server/public/v0.0.10
server/public/v0.0.11
server/public/v0.0.12
server/public/v0.0.13
server/public/v0.0.14
server/public/v0.0.15
server/public/v0.0.16
server/public/v0.0.17
server/public/v0.0.18
server/public/v0.0.5
server/public/v0.0.6
server/public/v0.0.7
server/public/v0.0.8
server/public/v0.0.9
server/public/v0.1.0
server/public/v0.1.1
server/public/v0.1.10
server/public/v0.1.11
server/public/v0.1.12
server/public/v0.1.13
server/public/v0.1.14
server/public/v0.1.15
server/public/v0.1.16
server/public/v0.1.17
server/public/v0.1.18
server/public/v0.1.19
server/public/v0.1.2
server/public/v0.1.3
server/public/v0.1.4
server/public/v0.1.5
server/public/v0.1.6
server/public/v0.1.7
server/public/v0.1.8
server/public/v0.1.9
v0.*
v0.5.0
v10.*
v10.11.0
v10.11.0-rc3
v10.11.1
v10.11.1-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
v10.12.0
v10.12.1
v10.12.1-rc1
v10.5.0
v10.5.0-rc6
v10.5.1
v10.5.1-rc1
v10.5.1-rc2
v10.5.10
v10.5.10-rc1
v10.5.10-rc2
v10.5.11
v10.5.11-rc1
v10.5.12
v10.5.12-rc1
v10.5.2
v10.5.3
v10.5.3-rc1
v10.5.4
v10.5.4-rc1
v10.5.4-rc2
v10.5.5
v10.5.5-rc1
v10.5.6
v10.5.6-rc1
v10.5.7
v10.5.8
v10.5.8-rc1
v10.5.9
v10.5.9-rc1
v10.5.9-rc2
v10.5.9-rc3
v10.5.9-rc4
v11.*
v11.0.0-alpha.1
v11.0.1
v11.0.1-rc1
v11.0.1-rc2
v11.0.1-rc3
v11.0.2
v11.0.3-rc1
v4.*
v4.10.0-rc1
v4.2.0-rc1
v4.3.0-rc1
v4.4.0-rc1
v4.5.0-rc1
v4.6.0-rc1
v4.6.0-rc2
v4.7.0-rc1
v4.8.0-rc1
v4.9.0-rc1
v5.*
v5.0.0-rc1
v5.1.0-rc1
v5.2.0-rc1
v5.2.0-rc2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-12421.json"