Vulnerability · Published Jun 16, 2026 · Assigned by GitHub_M

CVE-2026-48780Forem vulnerable to bypass of email address domain restrictions

High 8.2

In plain English

A high-severity improper authentication in forem from forem. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).

Severity (CVSS 3.1)8.2High

Exploit odds (30 days)0.2%top 87.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
forem	forem	< a2ab6d4

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

References

https://github.com/forem/forem/security/advisories/GHSA-3g4h-9h37-mpx6 x_refsource_CONFIRM
https://github.com/forem/forem/commit/a2ab6d409d2676eb0711ecbd737192043125b437 x_refsource_MISC