Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, unauthenticated users can determine whether a specific user is a member of a private group by observing changes in directory results when using the exclude_groups parameter. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, disable public access to the user directory via Admin → Settings → hide user profiles from public.
{
"cwe_ids": [
"CWE-203",
"CWE-639",
"CWE-862"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33425.json",
"cna_assigner": "GitHub_M"
}{
"versions": [
{
"introduced": "2026.1.0-latest"
},
{
"fixed": "2026.1.2"
}
]
}