AUGUST 15, 2026
Live Feed
Back to database
Case File

CVE-2026-72721

MEDIUM · CVSS 5.3 EPSS 0.43% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-10 · Last synced 2026-08-15

CyberRota Analysis

AI-Generated

The vulnerability affects the Onebox::DomainChecker component in Discourse, allowing attackers to bypass domain restrictions by exploiting case sensitivity in hostname comparisons. This could lead to unauthorized content being displayed, potentially compromising user trust and platform integrity. Organizations using affected versions should prioritize updating to versions 2026.1.6, 2026.5.2, 2026.6.1, or 2026.7.0 to mitigate this risk.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗ github.com ↗ github.com ↗ github.com ↗ github.com ↗ github.com ↗ github.com ↗ github.com ↗ github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-72721
Severity
MEDIUM
CVSS
5.3
EPSS
0.43%

Original NVD 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.