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Vulnerability record · CVE-2022-21684 · published 13 January 2022

CVE-2022-21684: Discourse improper authentication vulnerability

Discourse · Discourse

Discourse is an open source discussion platform. Versions prior to 2.7.13 in `stable`, 2.8.0.beta11 in `beta`, and 2.8.0.beta11 in `tests-passed` allow some users to log in to a community before they should be able to do so. A user invited via email to a forum with `must_approve_users` enabled is going to be automatically logged in, bypassing the check that does not allow unapproved users to sign in. They will be able to do everything an approved user can do. If they logout, they cannot log back in. This issue is patched in the `stable` version 2.7.13, `beta` version 2.8.0.beta11, and `tests-passed` version 2.8.0.beta11. One may disable invites as a workaround. Administrators can increase `min_trust_level_to_allow_invite` to reduce the attack surface to more trusted users.

8.8 CVSS 3.1 High EPSS 0.83% · top 44.1% CWE-287 · Improper authentication
8.8CVSS 3.1 base score, v2 6.0
0.83%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

Discourse is an open source discussion platform. Versions prior to 2.7.13 in `stable`, 2.8.0.beta11 in `beta`, and 2.8.0.beta11 in `tests-passed` allow some users to log in to a community before they should be able to do so. A user invited via email to a forum with `must_approve_users` enabled is going to be automatically logged in, bypassing the check that does not allow unapproved users to sign in. They will be able to do everything an approved user can do. If they logout, they cannot log back in. This issue is patched in the `stable` version 2.7.13, `beta` version 2.8.0.beta11, and `tests-passed` version 2.8.0.beta11. One may disable invites as a workaround. Administrators can increase `min_trust_level_to_allow_invite` to reduce the attack surface to more trusted users.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/discourse/discourse/commit/584c6a2e8bc705072b09a9c4b55126d6f8ed4ad2 PatchThird Party Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-p63q-jp48-h8xh PatchThird Party Advisory
https://meta.discourse.org/t/invite-redemption-allowed-user-to-access-forum-before-approval/214328 Issue TrackingPatchVendor Advisory
https://github.com/discourse/discourse/commit/584c6a2e8bc705072b09a9c4b55126d6f8ed4ad2 PatchThird Party Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-p63q-jp48-h8xh PatchThird Party Advisory
https://meta.discourse.org/t/invite-redemption-allowed-user-to-access-forum-before-approval/214328 Issue TrackingPatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2022-21684), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.