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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-92161
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 16:17:29 UTC
Updated2026-09-25 16:17:29 UTC
DescriptionFriendsOfFlarum 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

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

Problem Types: CWE-345 | CWE-345 CWE-345: Insufficient Verification of Data Authenticity

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA FriendsOfFlarum Oauth affected < 1.7.4 Not specified
CNA FriendsOfFlarum Oauth affected >= 2.0.0-beta.1, < 2.0.0-beta.4 Not specified

References

ReferenceSourceLinkTags
github.com/FriendsOfFlarum/oauth/security/advisories/GHSA-g7vj-c29h-3h5m [email protected] github.com
github.com/FriendsOfFlarum/oauth/commit/baca3466b3b7be51c70a7e0ba966901a... [email protected] github.com
github.com/FriendsOfFlarum/oauth/releases/tag/2.0.0-beta.4 [email protected] github.com
github.com/FriendsOfFlarum/oauth/commit/bb4bf376832e6bb68c579715d2a4b5a9... [email protected] github.com
github.com/FriendsOfFlarum/oauth/releases/tag/1.7.4 [email protected] github.com
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