What is CVE-2026-72728?

CVE-2026-72728 is a medium-severity vulnerability in Discourse, classified under Improper Input Validation. CVSS score: 6.3/10. Published 2026-08-10.

How severe is CVE-2026-72728?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Improper input validation in Discourse

CVE-2026-72728

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…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

Affected products

Discourse — versions < 2026.1.7, >= 2026.6.0-latest, < 2026.6.2, >= 2026.7.0-latest, < 2026.7.1

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-72728?: CVE-2026-72728 is a medium-severity vulnerability in Discourse, classified under Improper Input Validation. CVSS score: 6.3/10. Published 2026-08-10.
How severe is CVE-2026-72728?: Medium severity. CVSS v3 base score is 6.3 out of 10.