VulnerabilityDeferred

CVE-2026-72728

Prior to 2026.1.7, an authenticated user could submit specially formed URLs that bypassed the Onebox allowlist and embedded malicious content in a site.

MEDIUM 6.3EPSS 0.18%

Does this matter?

Lower severity and a low EPSS score (0.18%). Track it; it rarely justifies an emergency change on its own.

Description

Discourse is an open-source discussion platform. Prior to 2026.1.7, an authenticated user could submit specially formed URLs that bypassed the Onebox allowlist and embedded malicious content in a site. This issue is fixed in versions 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0-latest.1.

CVSS 3.1: 6.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
EPSS: 0.18% probability · 8th percentile
CISA KEV: Not listed
Weakness: CWE-20
Source: security-advisories@github.com

References

https://github.com/discourse/discourse/commit/92eec47e8b477cb8b4ccdb237e26dc1ba8f8b76b
https://github.com/discourse/discourse/security/advisories/GHSA-qp9j-3v7r-wrvr

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.