FriendsOfFlarum OAuth up to 1.7.3/2.0.0-beta.3 Discord OAuth Provider provideTrustedEmail Verified improper authentication

Summaryinfo

A vulnerability classified as critical was found in FriendsOfFlarum OAuth up to 1.7.3/2.0.0-beta.3. The impacted element is the function provideTrustedEmail of the component Discord OAuth Provider. The manipulation of the argument Verified results in improper authentication. This vulnerability is known as CVE-2026-92161. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, was found in FriendsOfFlarum OAuth up to 1.7.3/2.0.0-beta.3. Affected is the function provideTrustedEmail of the component Discord OAuth Provider. The manipulation of the argument verified with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-92161 since 09/15/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

Upgrading to version 1.7.4 or 2.0.0-beta.4 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• FriendsOfFlarum

Name

• OAuth

Version

• 1.7.0
• 1.7.1
• 1.7.2
• 1.7.3
• 2.0.0-beta.0
• 2.0.0-beta.1
• 2.0.0-beta.2
• 2.0.0-beta.3

Website

• Product: https://github.com/FriendsOfFlarum/oauth/

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Once again VulDB remains the best source for vulnerability data.

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