CVE-2021-37703 Information exposure in Discourse
Attackers can view private user read states and notification levels in Discourse forums, exposing sensitive user activity data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-37703?
CVE-2021-37703 is a medium-severity vulnerability in Discourse Discourse, published on 13 Aug 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Discourse is an open-source platform for community discussion. In Discourse before versions 2.7.8 and 2.8.0.beta5, a user's read state for a topic such as the last read post number and the notification level is exposed.
Weakness: CWE-200
Which versions are affected by CVE-2021-37703?
1 open source package ship an affected version, including discourse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
discourse Bitnami | All versions | 2.7.8 |
Products include Discourse Discourse.
How do I fix CVE-2021-37703?
Upgrade discourse to 2.7.8 or later.
Is CVE-2021-37703 being exploited?
There is no known exploitation of CVE-2021-37703 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-2021-37703, GHSA-gq2h-qhg2-phf9.