CVE-2026-48780 Forem vulnerable to bypass of email address domain restrictions
Attackers can bypass email domain restrictions to gain unauthorized access to invite-only Forem community deployments.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-48780?
CVE-2026-48780 is a high-severity authentication bypass vulnerability in forem, published on 16 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-287
Which versions are affected by CVE-2026-48780?
How do I fix CVE-2026-48780?
No fix has been published for CVE-2026-48780 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-48780 being exploited?
There is no known exploitation of CVE-2026-48780 in the wild and no public exploit code.
Sources
Also known as GHSA-3g4h-9h37-mpx6.