CSRF Protection Bypass Allows Updating a User's Authentication Method
Summary
| CVE | CVE-2026-28741 |
|---|---|
| State | PUBLISHED |
| Assigner | Mattermost |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-15 11:16:33 UTC |
| Updated | 2026-04-22 19:42:25 UTC |
| Description | Mattermost versions 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to validate CSRF tokens on an authentication endpoint which allows an attacker to update a user's authentication method via a CSRF attack by tricking a user into visiting a malicious page. Mattermost Advisory ID: MMSA-2026-00625 |
Risk And Classification
Primary CVSS: v3.1 8.1 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
EPSS: 0.000160000 probability, percentile 0.035320000 (date 2026-04-21)
Problem Types: CWE-352 | CWE-352 CWE-352: Cross-Site Request Forgery (CSRF)
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 8.1 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
| 3.1 | [email protected] | Secondary | 6.8 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
| 3.1 | CNA | CVSS | 6.8 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
RequiredScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Mattermost | Mattermost Server | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Mattermost | Mattermost | affected 10.11.0 10.11.12 semver | Not specified |
| CNA | Mattermost | Mattermost | affected 11.5.0 11.5.0 semver | Not specified |
| CNA | Mattermost | Mattermost | affected 11.4.0 11.4.2 semver | Not specified |
| CNA | Mattermost | Mattermost | affected 11.3.0 11.3.2 semver | Not specified |
| CNA | Mattermost | Mattermost | unaffected 10.11.13 | Not specified |
| CNA | Mattermost | Mattermost | unaffected 11.5.1 | Not specified |
| CNA | Mattermost | Mattermost | unaffected 11.4.3 | Not specified |
| CNA | Mattermost | Mattermost | unaffected 11.3.3 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| mattermost.com/security-updates | [email protected] | mattermost.com | Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Eva Sarafianou (en)
Additional Advisory Data
Solutions
CNA: Update Mattermost to versions 10.11.13, 11.5.1, 11.4.3, 11.3.3 or higher.
There are currently no legacy QID mappings associated with this CVE.