CVE-2026-48780: Forem

High severity, CVSS 8.2. EPSS: 0.4% chance of exploitation in the next 30 days.

Forem is open source software for building communities. Prior to commit a2ab6d4, a maliciously crafted email address could allow an attacker to bypass domain allowlist or denylist restrictions and gain access to invite-only forem deployments. The issue is patched as of `a2ab6d4`. As a workaround, some SMTP servers and email delivery providers may drop or refuse to send maliciously crafted email addresses.

Affected products

• Forem Forem: before a2ab6d4 (fixed in a2ab6d4)

Published 2026-06-16. Last modified 2026-06-17.