Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
forem forem
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 8.2 · High EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1556.001 · Domain Controller Authentication

Affected Version Matrix 1

VendorProduct Version RangeStatus
forem forem < a2ab6d4 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-48780

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Forem vulnerable to bypass of email address domain restrictions
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
forem forem < a2ab6d4 -

II. Public POCs for CVE-2026-48780

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
default-local-qwen3.6 · 12123 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-48780

请登录查看更多情报信息。

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

Vendor Advisories for CVE-2026-48780 (1)

IV. Related Vulnerabilities

Same product: forem
Same vendor: forem
Same weakness: CWE-287