CVE-2021-43792 Notifications leak in Discourse
Revoked staff users may still receive notifications for restricted tags, leaking sensitive information to unauthorized users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-43792?
CVE-2021-43792 is a medium-severity vulnerability in Discourse Discourse, published on 1 Dec 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Discourse is an open source discussion platform. In affected versions a vulnerability affects users of tag groups who use the "Tags are visible only to the following groups" feature. A tag group may only allow a certain group (e.g. staff) to view certain tags. Users who were tracking or watching the tags via /preferences/tags, then have their staff status revoked will still see notifications related to the tag, but will not see the tag on each topic. This issue has been patched in stable version 2.7.11. Users are advised to upgrade as soon as possible.
Weakness: CWE-200
Which versions are affected by CVE-2021-43792?
1 open source package ship an affected version, including discourse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
discourse Bitnami | All versions | 2.7.11 |
Products include Discourse Discourse.
How do I fix CVE-2021-43792?
Upgrade discourse to 2.7.11 or later.
Is CVE-2021-43792 being exploited?
There is no known exploitation of CVE-2021-43792 in the wild and no public exploit code.
Other vulnerabilities in Discourse Discourse
- CVE-2021-41163 RCE via malicious SNS subscription payload
- CVE-2022-36066 Discourse vulnerable to RCE via admins uploading maliciously zipped file
- CVE-2022-39356 Discourse user account takeover via email and invite link
- CVE-2023-22468 Discourse vulnerable to Cross-site Scripting in local oneboxes
- CVE-2026-27934 Discourse leaks private topic title and post excerpt via user action API endpoint
Sources
Also known as BIT-discourse-2021-43792, GHSA-pq2x-vq37-8522.