> CVE-2026-28741 [MEDIUM]

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PUBLISHED
2026-04-15 11:16
MODIFIED
2026-04-15 11:16
CVSS_SCORE V3
6.8
EPSS (Prob. Exploit)
0.18%
Top 93.3%
DATA SOURCES:
NVD 🔗 2026-04-15 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-10-25 GITHUB 🔗 2026-11-05

> 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

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
EXPLOITABILITY
1.6
IMPACT
5.2

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
High (H)
Conditions spécifiques doivent être réunies pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
Required (R)
Nécessite une action utilisateur (clic lien, ouverture fichier, etc.)
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
High (H)
Divulgation totale d'informations
I (Impact Intégrité)
Integrity Impact
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
High
Divulgation totale d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-352

> CWE DETAILED DESCRIPTIONS

CWE-352: Cross-Site Request Forgery - The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.

> GITHUB SECURITY ADVISORY

GHSA-m7cf-4gh2-v4qg MODERATE

Mattermost doesn't validate CSRF tokens on an authentication endpoint

AFFECTED PACKAGES:
GO / github.com/mattermost/mattermost/server/v8
>= 11.3.0-rc1, < 11.3.3
Fixed in: 11.3.3
GO / github.com/mattermost/mattermost/server/v8
>= 11.4.0-rc1, < 11.4.3
Fixed in: 11.4.3
GO / github.com/mattermost/mattermost/server/v8
= 11.5.0-rc1
Fixed in: 11.5.0
GO / github.com/mattermost/mattermost/server/v8
>= 8.0.0-20250721062209-4952acea88ce, < 8.0.0-20260220133927-c29cf05d40f8
Fixed in: 8.0.0-20260220133927-c29cf05d40f8

> HISTORIQUE DES MODIFICATIONS

Première apparition
15/04/2026 11:16
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:59
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-352: Cross-Site Request Forgery (CSRF) - The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could hav...
Nouvelle valeur:
CWE-352: Cross-Site Request Forgery - The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have origi...
📊 ENRICHISSEMENT 01/05/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-352: Cross-Site Request Forgery (CSRF) - The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could hav...
Total des modifications: 2 Dernière mise à jour: 1 week ago

> REFERENCES

https://mattermost.com/security-updates
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