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Mattermost doesn't validate CSRF tokens on an authentication endpoint

🗓️ 17 Apr 2026 15:31:17Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 28 Views

Mattermost CSRF validation fails on authentication endpoint, enabling CSRF to update a user's method.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-28741
15 Apr 202610:13
–attackerkb
bdu_fstec
BDU FSTEC
Mattermost CSRF
5 Jun 202600:00
–bdu_fstec
circl
Circl
CVE-2026-28741
15 Apr 202612:08
–circl
cnnvd
CNNVD
Mattermost security vulnerabilities
15 Apr 202600:00
–cnnvd
cve
CVE
CVE-2026-28741
15 Apr 202610:13
–cve
cvelist
Cvelist
CVE-2026-28741 CSRF Protection Bypass Allows Updating a User's Authentication Method
15 Apr 202610:13
–cvelist
euvd
EUVD
EUVD-2026-22875
17 Apr 202615:31
–euvd
nessus
Tenable Nessus
Mattermost Server 10.11.x <= 10.11.13 / 11.3.x < 11.3.3 / 11.4.x < 11.4.3 / 11.5.x < 11.5.1 / 11.6.0 Multiple Vulnerabilities (MMSA-2026-00624 / MMSA-2026-00625)
24 Apr 202600:00
–nessus
mend
Mend
CVE-2026-28741
15 Apr 202610:13
–mend
nvd
NVD
CVE-2026-28741
15 Apr 202611:16
–nvd
Rows per page
Vulners
Node
OR
mattermostmattermostRange11.3.0-rc1–11.3.3go
mattermostmattermostRange11.4.0-rc1–11.4.3go
mattermostmattermostMatch11.5.0-rc1go
mattermostmattermostRange8.0.0-20250721062209-4952acea88ce–8.0.0-20260220133927-c29cf05d40f8go

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29 Apr 2026 20:35Current
7.1High risk
Vulners AI Score7.1
CVSS 3.16.8 - 8.1
EPSS0.00129
SSVC
28