Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, Onebox::DomainChecker.is_blocked? compares hostnames and SiteSetting.blocked_onebox_domains entries case-sensitively, allowing an attacker to bypass configured Onebox domain restrictions by changing character casing in a redirect target hostname. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
Metrics
Affected Vendors & Products
References
History
Tue, 11 Aug 2026 04:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Discourse
Discourse discourse |
|
| Vendors & Products |
Discourse
Discourse discourse |
Mon, 10 Aug 2026 17:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Mon, 10 Aug 2026 16:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, Onebox::DomainChecker.is_blocked? compares hostnames and SiteSetting.blocked_onebox_domains entries case-sensitively, allowing an attacker to bypass configured Onebox domain restrictions by changing character casing in a redirect target hostname. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0. | |
| Title | Discourse: Onebox Domain Blocklist Bypass via Case-Sensitive Comparison | |
| Weaknesses | CWE-178 | |
| References |
|
|
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-08-10T16:59:07.554Z
Reserved: 2026-08-10T13:48:09.545Z
Link: CVE-2026-72721
Updated: 2026-08-10T16:59:02.627Z
Status : Received
Published: 2026-08-10T16:19:49.360
Modified: 2026-08-10T17:17:36.597
Link: CVE-2026-72721
No data.
OpenCVE Enrichment
Updated: 2026-08-11T04:30:03Z