CVE-2026-121450— CFNext before 3.1.0 Admin Password Recovery via MD5-Derived Subscription UUID

Quick assessment

Affected

PAICNI CFNext

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CFNext 3.1.0 之前的版本存在弱密码派生漏洞：由于订阅 UUID 是使用固定公开盐值对密码进行 MD5 哈希生成的结果，订阅链接持有者能够据此恢复管理员密码。攻击者可在无速率限制的情况下离线暴力破解密码，随后登录管理员面板，读取其中存储的 Trojan、Clash、Telegram 和 Cloudflare 等 API 密钥。

CVSS 7.5 · High EPSS 0.26% · P18 Updated Nov 03, 2026

Possible ATT&CK Techniques 2 AI

T1552.004 · Private Keys T1110.001 · Password Guessing

Affected Version Matrix 1

Vendor	Product	Version Range	Status
PAICNI	CFNext	`< 3.1.0`	affected

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Vulnerability Information

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Vulnerability Title

CFNext before 3.1.0 Admin Password Recovery via MD5-Derived Subscription UUID

Source: CVE Program / CVE List V5

Vulnerability Description

CFNext before 3.1.0 contains a weak cryptographic derivation vulnerability that allows subscription link holders to recover the admin password because the subscription UUID is an MD5 of the password with a fixed public salt. Attackers can brute-force the password offline without rate limiting, log into the admin panel, and read stored Trojan, Clash, Telegram and Cloudflare API secrets.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

使用可预测Salt的单向哈希算法

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
PAICNI	CFNext	0 ~ 3.1.0	-

II. Public POCs for CVE-2026-121450

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-121450

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Other References for CVE-2026-121450 (6)

https://github.com/PAICNI/CFNext/blob/1c7b3d8bed5b06a1449ea28302bb9a648f67e8e1/CFNext-%E6%98%8E%E6%96%87%E7%89%88.js#L12 technical-description
https://github.com/PAICNI/CFNext product
https://github.com/PAICNI/CFNext/blob/1c7b3d8bed5b06a1449ea28302bb9a648f67e8e1/CFNext-%E6%98%8E%E6%96%87%E7%89%88.js#L2440 technical-description
https://github.com/PAICNI/CFNext/commit/ca8ad82bb7c635f765c82a1cd0c954fd70d81fb7 patch
https://github.com/PAICNI/CFNext/issues/57 issue-tracking
https://www.vulncheck.com/advisories/cfnext-before-3.1.0-admin-password-recovery-via-md5-derived-subscription-uuid third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-121450

IV. Related Vulnerabilities

Same weakness: CWE-760