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PUBLISHED

2026-09-25 16:17

MODIFIED

2026-09-25 16:17

CVSS_SCORE V3

9.8

EPSS (Prob. Exploit)

0.27%

Top 81.5%

DATA SOURCES:

NVD 🔗 2026-09-25 CWE MITRE 🔗 2026-10-01 FIRST EPSS 🔗 2026-10-22 GITHUB 🔗 2026-10-08 OSV 🔗 2026-10-19

> DESCRIPTION

FriendsOfFlarum OAuth allows users to log in to Flarum with GitHub, Twitter, Facebook, and other providers. Prior to 1.7.4 and 2.0.0-beta.4, the Discord OAuth provider does not check the verified field returned for an OAuth email before passing the address to Flarum core as trusted through provideTrustedEmail(). When Discord sign-in is enabled, an unauthenticated attacker who knows the email address of a Flarum user can configure a Discord account with that unverified address and a verified phone number, then sign in to cause Flarum to match the trusted address, link the attacker-controlled Discord identity to the existing user, and authenticate as the victim without a password or victim interaction. Exploitation requires that the victim's email address is not already associated with a Discord account, and it can compromise administrator accounts. Other bundled providers were not confirmed to be practically exploitable by this method because their relevant authentication flows return only verified or confirmed email addresses. This issue is fixed in versions 1.7.4 and 2.0.0-beta.4.

> 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:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EXPLOITABILITY

3.9

IMPACT

5.9

> MÉTRIQUES CVSS DÉTAILLÉES

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

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	Low (L)	Peu de conditions requises pour exploiter
PR (Privilèges Requis) Privileges Required	None (N)	Aucune authentification requise
UI (Interaction Utilisateur) User Interaction	None (N)	Aucune interaction utilisateur nécessaire
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	High (H)	Interruption totale du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité

High

Divulgation totale d'informations

Intégrité

High

Modification totale des données possible

Disponibilité

High

Interruption totale du service possible

> WEAKNESSES

CWE-345

> CWE DETAILED DESCRIPTIONS

CWE-345: Insufficient Verification of Data Authenticity - The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.

> GITHUB SECURITY ADVISORY

GHSA-g7vj-c29h-3h5m CRITICAL

FriendsOfFlarum OAuth: Unauthenticated account takeover via unverified email trust in Discord OAuth provider

AFFECTED PACKAGES:

COMPOSER / fof/oauth

>= 2.0.0-beta.1, < 2.0.0-beta.4

Fixed in: 2.0.0-beta.4

COMPOSER / fof/oauth

< 1.7.4

Fixed in: 1.7.4

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

FriendsOfFlarum OAuth: Unauthenticated account takeover via unverified email trust in Discord OAuth provider

AFFECTED PACKAGES:

Unknown / Unknown

50 versions affected

ALIASES:

GHSA-g7vj-c29h-3h5m

> HISTORIQUE DES MODIFICATIONS

Première apparition

25/09/2026 16:17

Source: NVD

📊 ENRICHISSEMENT 01/10/2026 06:01

CWE

Champ modifié: Description CWE

Ancienne valeur:

N/A

Nouvelle valeur:

CWE-345: Insufficient Verification of Data Authenticity - The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.

Total des modifications: 1 Dernière mise à jour: 3 weeks ago