Discourse is an open source platform for community discussion. Prior to version 2.8.4 on the stable branch and 2.9.0beta5 on the beta and tests-passed branches, inviting users on sites that use single sign-on could bypass the must_approve_users check and invites by staff are always approved automatically. The issue is patched in Discourse version 2.8.4 on the stable branch and version 2.9.0.beta5 on the beta and tests-passed branches. As a workaround, disable invites or increase min_trust_level_to_allow_invite to reduce the attack surface to more trusted users.
| Software | From | Fixed in |
|---|---|---|
| discourse / discourse | 2.9.0-beta1 | 2.9.0-beta1.x |
| discourse / discourse | 2.9.0-beta2 | 2.9.0-beta2.x |
| discourse / discourse | 2.9.0-beta3 | 2.9.0-beta3.x |
| discourse / discourse | - | 2.8.4 |
| discourse / discourse | 2.9.0-beta4 | 2.9.0-beta4.x |