CVE-2026-28741 | BDVDB-2026-327258 Detail

MattermostMattermost

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

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact none. Attack vector: network.

Weaknesses#

CWE-352 Cross-Site Request Forgery (CSRF)

References#

https://mattermost.com/security-updates

Exploit#

No public exploit known

History#

Version 12026-04-15Record published in the CVE List.

Published

Published: 2026-04-15
Last modified: 2026-04-15

Vendor information

Vendor: Mattermost
Product: Mattermost

All Mattermost vulnerabilities

Score

6.8 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 2.6.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Cross-Site Request Forgery

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 10.11.0 and <= 10.11.12
Fixed
Not stated
Vulnerable
>= 11.5.0 and <= 11.5.0
Fixed
Not stated
Vulnerable
>= 11.4.0 and <= 11.4.2
Fixed
Not stated
Vulnerable
>= 11.3.0 and <= 11.3.2
Fixed
Not stated
Vulnerable
Not stated
Fixed
10.11.13
Vulnerable
Not stated
Fixed
11.5.1
Vulnerable
Not stated
Fixed
11.4.3
Vulnerable
Not stated
Fixed
11.3.3

Scoring System

CVSS v4.0

Not available

CVSS v3.1

6.8 Medium

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Metric breakdown
Attack Vector	Network
Attack Complexity	High
Privileges Required	None
User Interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).