CVE-2026-28741

Name: CVE-2026-28741
Creator: NVD / NIST
Published: 2026-04-15T11:16:33.45+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 0.13%

Last modified Jun 17, 2026

CVE-2026-28741 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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. EPSS estimates a 0.13% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

8.1/10

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

EPSS Probability

0.13%

2.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Mattermost	Mattermost Server	>= 10.11.0, < 10.11.13
Mattermost	Mattermost Server	>= 11.3.0, < 11.3.3
Mattermost	Mattermost Server	>= 11.4.0, < 11.4.3
Mattermost	Mattermost Server	>= 11.5.0, < 11.5.1

References

https://mattermost.com/security-updatesVendor Advisory

Timeline

Published: Apr 15, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-28741?

How severe is CVE-2026-28741?

CVE-2026-28741 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.13% probability of exploitation in the next 30 days.

How do I fix CVE-2026-28741?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-28741?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST