Flarum is open source discussion platform software. Prior to version 1.8.5, the Flarum `/logout` route includes a redirect parameter that allows any third party to redirect users from a (trusted) domain of the Flarum installation to redirect to any link. For logged-in users, the logout must be confirmed. Guests are immediately redirected. This could be used by spammers to redirect to a web address using a trusted domain of a running Flarum installation. The vulnerability has been fixed and published as flarum/core v1.8.5. As a workaround, some extensions modifying the logout route can remedy this issue if their implementation is safe.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| flarum/core(Packagist) | 0 | 1.8.5 | N/A |
| flarum/framework(Packagist) | 0 | 1.8.5 | N/A |
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