CVE-2022-21684

Name: CVE-2022-21684
Creator: NVD / NIST
Published: 2022-01-13T21:15:08.747+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.96%

Last modified Jun 17, 2026

CVE-2022-21684 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 0.96% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.96%

57.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Discourse	Discourse	< 2.7.13	—
Discourse	Discourse	2.8.0	Beta1

References

https://github.com/discourse/discourse/commit/584c6a2e8bc705072b09a9c4b55126d6f8ed4ad2Patch, Third Party Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-p63q-jp48-h8xhPatch, Third Party Advisory
https://meta.discourse.org/t/invite-redemption-allowed-user-to-access-forum-before-approval/214328Issue Tracking, Patch, Vendor Advisory
https://github.com/discourse/discourse/commit/584c6a2e8bc705072b09a9c4b55126d6f8ed4ad2Patch, Third Party Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-p63q-jp48-h8xhPatch, Third Party Advisory
https://meta.discourse.org/t/invite-redemption-allowed-user-to-access-forum-before-approval/214328Issue Tracking, Patch, Vendor Advisory

Timeline

Published: Jan 13, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-21684?

How severe is CVE-2022-21684?

CVE-2022-21684 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.96% probability of exploitation in the next 30 days.

How do I fix CVE-2022-21684?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-21684?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST