CVE-2026-121450 Details
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.
A vulnerability exists in CFNext versions prior to 3.1.0, where the subscription UUID is generated as an MD5 hash of the admin password combined with a fixed public salt. This predictable derivation allows holders of the subscription link to recover the admin password. The vulnerability arises because the same unsalted MD5 hash of the password is used as the admin session cookie, enabling offline brute-force attacks without any rate limiting. Once the password is obtained, an attacker can log into the admin panel and access sensitive API secrets.
Users can update to CFNext version 3.1.0 or later, where this vulnerability has been addressed. Instructions for updating are available in the CFNext repository.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 3, 2026CISA-ADP
Assessed Nov 7, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/PAICNI/CFNext/issues/57 | CISA-ADP | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/PAICNI/CFNext | [email protected] | ProductSource CodeVendor |
| https://github.com/PAICNI/CFNext/blob/1c7b3d8bed5b06a1449ea28302bb9a648f67e8e1/CFNext-%E6%98%8E%E6%96%87%E7%89%88.js#L12 | [email protected] | Source CodeVendor |
| https://github.com/PAICNI/CFNext/blob/1c7b3d8bed5b06a1449ea28302bb9a648f67e8e1/CFNext-%E6%98%8E%E6%96%87%E7%89%88.js#L2440 | [email protected] | Source CodeVendor |
| https://github.com/PAICNI/CFNext/commit/ca8ad82bb7c635f765c82a1cd0c954fd70d81fb7 | [email protected] | Source CodeVendor |
| https://github.com/PAICNI/CFNext/issues/57 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://www.vulncheck.com/advisories/cfnext-before-3.1.0-admin-password-recovery-via-md5-derived-subscription-uuid | [email protected] | AdvisoryRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-760 | Use of a One-Way Hash with a Predictable Salt | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| PAICNI CFNext | >= 0, < 3.1.0 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 7, 2026 | CVE Modified | CISA-ADP |
| Nov 3, 2026 | New CVE Received | [email protected] |