CVE-2024-43789 Denial of service by the absence of restrictions on replies to posts in Discourse
Attackers can cause denial of service by creating posts with excessive replies and fetching them, impacting Discourse instance availability.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-43789?
CVE-2024-43789 is a high-severity denial of service vulnerability in Discourse Discourse, published on 7 Oct 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Discourse is an open source platform for community discussion. A user can create a post with many replies, and then attempt to fetch them all at once. This can potentially reduce the availability of a Discourse instance. This problem has been patched in the latest version of Discourse. All users area are advised to upgrade. There are no known workarounds for this vulnerability.
Weakness: CWE-400
Which versions are affected by CVE-2024-43789?
1 open source package ship an affected version, including discourse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
discourse Bitnami | All versions | 3.3.1 |
Products include Discourse Discourse.
How do I fix CVE-2024-43789?
Upgrade discourse to 3.3.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2024-43789 being exploited?
There is no known exploitation of CVE-2024-43789 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-2024-43789, GHSA-62cq-cpmc-hvqq.