CVE WatchAug 10, 2026

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? comp

CVSS

5.3

Medium

EPSS

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KEV

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Exploit Today

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0-100

Published: Aug 10, 2026 · Last modified: Aug 10, 2026 · CWE-178

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

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