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

CVSS 8.2 · High EPSS 0.22% · P12

Affected Version Matrix 1

VendorProductVersion RangeStatus
foremforem< a2ab6d4affected
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I. Basic Information for CVE-2026-48780

Vulnerability Information
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Vulnerability Title
Forem vulnerable to bypass of email address domain restrictions
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证机制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Forem 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
forem是Forem公司开源的一个构建在线社区/论坛的Ruby开源项目。 Forem a2ab6d4之前版本存在授权问题漏洞，该漏洞源于身份验证问题，可能导致攻击者绕过域名白名单或黑名单限制，获得对仅邀请的Forem部署的访问权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
foremforem < a2ab6d4 -

II. Public POCs for CVE-2026-48780

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III. Intelligence Information for CVE-2026-48780

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Patches & Fixes for CVE-2026-48780 (1)

Vendor Advisories for CVE-2026-48780 (1)

IV. Related Vulnerabilities

Same weakness: CWE-287

V. Comments for CVE-2026-48780

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