MEDIUMVulnerability
CVE-2026-72721
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.
Properties
- severity
- MEDIUM
- score
- 5.3
- epss_score
- 0.00429
- cve_id
- CVE-2026-72721
- vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- published_at
- 2026-08-10T16:19:49.360
- last_modified
- 2026-09-08T20:54:37.790
- epss_percentile
- 0.35987
Related Entities (3)
ENRICHED_BY (1)
→[Source]FIRST EPSS
HAS_WEAKNESS (1)
→[Weakness]Improper Handling of Case Sensitivity
DESCRIBED_BY (1)
→[Source]NVD
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