CVE-2022-39378 Displaying user badges can leak topic titles to users that have no access to the topic

What is CVE-2022-39378?

CVE-2022-39378 is a medium-severity vulnerability in Discourse Discourse, published on 2 Nov 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Discourse is a platform for community discussion. Under certain conditions, a user badge may have been awarded based on a user's activity in a topic with restricted access. Before this vulnerability was disclosed, the topic title of the topic associated with the user badge may be viewed by any user. If there are sensitive information in the topic title, it will therefore have been exposed. This issue is patched in the latest stable, beta and tests-passed versions of Discourse. There are currently no known workarounds available.

Weakness: CWE-200

Which versions are affected by CVE-2022-39378?

1 open source package ship an affected version, including discourse. It affects 1 product.

Products include Discourse Discourse.

How do I fix CVE-2022-39378?

Upgrade discourse to 2.8.9 or later.

Is CVE-2022-39378 being exploited?

There is no known exploitation of CVE-2022-39378 in the wild and no public exploit code.

Other vulnerabilities in Discourse Discourse

• CVE-2021-41163 RCE via malicious SNS subscription payload Critical 10.0
• CVE-2022-36066 Discourse vulnerable to RCE via admins uploading maliciously zipped file Critical 9.1
• CVE-2022-39356 Discourse user account takeover via email and invite link High 8.9
• CVE-2023-22468 Discourse vulnerable to Cross-site Scripting in local oneboxes High 8.8
• CVE-2026-27934 Discourse leaks private topic title and post excerpt via user action API endpoint High 8.7

All Discourse Discourse vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-discourse-2022-39378, GHSA-2gvq-27h6-4h5f.