Medium severity5.3NVD Advisory· Published Aug 10, 2026· Updated Aug 10, 2026
CVE-2026-72721
CVE-2026-72721
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1- Range: >=2026.1.6, >=2026.5.2, >=2026.6.1, >=2026.7.0
Patches
Vulnerability mechanics
References
9- github.com/discourse/discourse/commit/a3e10759fef47f03d450649bb51d9e84f4c68b8fnvd
- github.com/discourse/discourse/commit/c2eb6b0e5597d6f28f4be739b83300bc9c69e3cdnvd
- github.com/discourse/discourse/commit/caa615c371b1696982ee11ac8f3558f0f8ced584nvd
- github.com/discourse/discourse/commit/f503971d311b7b0dfdb751ee8cfd67e8cb99f5c5nvd
- github.com/discourse/discourse/pull/42091nvd
- github.com/discourse/discourse/pull/42092nvd
- github.com/discourse/discourse/pull/42093nvd
- github.com/discourse/discourse/pull/42094nvd
- github.com/discourse/discourse/security/advisories/GHSA-3x7x-24rq-h5j6nvd
News mentions
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