CVE-2025-3256: Xujiangfei Admintwo Auth Bypass Flaw

CVE-2025-3256 Overview

CVE-2025-3256 is an improper access control vulnerability in xujiangfei admintwo version 1.0. The flaw resides in the /user/updateSet endpoint, where manipulation of the email argument bypasses authorization checks. Authenticated attackers can exploit the issue remotely over the network to modify account data belonging to other users, resulting in a horizontal privilege escalation condition. The weakness is classified under [CWE-266: Incorrect Privilege Assignment]. Public disclosure of the exploit details has occurred through a GitHub PoC Repository and VulDB #303326.

Critical Impact
Authenticated remote attackers can tamper with arbitrary user account attributes via the email parameter in /user/updateSet, breaking the application's authorization model.

Affected Products

xujiangfei admintwo 1.0
CPE: cpe:2.3:a:xujiangfei:admintwo:1.0:*:*:*:*:*:*:*
Component: xujiangfei:admintwo

Discovery Timeline

2025-04-04 - CVE-2025-3256 published to NVD
2025-10-09 - Last updated in NVD database

Technical Details for CVE-2025-3256

Vulnerability Analysis

The vulnerability targets the /user/updateSet handler in admintwo 1.0. The endpoint accepts an email parameter to update user account information but fails to verify whether the requesting session owns the target record. As a result, any authenticated low-privileged user can submit a crafted request to alter another user's email address. This represents a horizontal privilege escalation, as confirmed by the public proof-of-concept titled 水平越权 (horizontal privilege escalation) in the referenced repository.

The attack requires no user interaction and can be launched over the network. Because the application enforces only authentication rather than per-resource authorization, attackers can pivot to account takeover by changing the email address used for password resets or notifications.

Root Cause

The root cause is missing object-level authorization within the /user/updateSet controller. The handler trusts client-supplied identifiers when locating and updating the target record, instead of binding the update to the authenticated session's user ID. This pattern aligns with [CWE-266] and reflects a broader Broken Access Control class of flaws.

Attack Vector

An attacker authenticates to the admintwo application using any valid low-privileged account. The attacker then issues a request to /user/updateSet containing the victim's identifier alongside an attacker-controlled email value. The server processes the update without verifying ownership, persisting the change. The attacker can subsequently trigger a password reset email to the new address and seize the victim's account. Refer to the GitHub PoC Repository for the request sequence demonstrated by the original submitter.

Detection Methods for CVE-2025-3256

Indicators of Compromise

Unexpected POST or PUT requests to /user/updateSet originating from low-privileged accounts targeting other users' records.
User records exhibiting email field changes without a corresponding self-service request from the legitimate owner.
Password reset emails sent to addresses that do not match historical user-provided values.

Detection Strategies

Instrument the application to log the authenticated session user alongside the target user ID for every /user/updateSet invocation, and alert when these values diverge.
Deploy a Web Application Firewall (WAF) rule that inspects request bodies to /user/updateSet and flags requests where the session principal does not match the affected record.
Correlate authentication logs with subsequent profile update events to identify anomalous cross-account modifications.

Monitoring Recommendations

Enable verbose audit logging for all profile management endpoints, including /user/updateSet, capturing before-and-after state of the email field.
Monitor for bursts of profile updates from a single source IP or session within short time windows.
Forward application and authentication logs to a centralized SIEM for cross-event correlation and historical baselining.

How to Mitigate CVE-2025-3256

Immediate Actions Required

Restrict network exposure of the admintwo 1.0 instance by placing it behind a VPN or IP allowlist until a fix is available.
Audit the users table for unexpected email changes occurring after the application was deployed and reset affected accounts.
Disable or gate the /user/updateSet endpoint at the reverse proxy if profile self-service is not business-critical.

Patch Information

No official vendor advisory or patched release has been published for xujiangfei admintwo at the time of the NVD entry on 2025-04-04. Organizations operating the affected version should treat the deployment as unpatched and apply compensating controls. Track the vendor's repository for future updates and consult VulDB CTI ID #303326 for additional context.

Workarounds

Modify the /user/updateSet controller to derive the target user ID from the authenticated session rather than from request parameters.
Add a server-side ownership check that compares the session principal against the record being modified before any database write.
Apply a WAF virtual patch that blocks /user/updateSet requests whose body parameters reference user identifiers other than the authenticated user's own ID.

bash

# Example reverse-proxy guardrail (nginx) to block anonymous and 
# cross-user access to the vulnerable endpoint until code-level fixes ship
location = /user/updateSet {
    # Require authentication header
    if ($http_authorization = "") { return 401; }
    # Restrict to internal management network only
    allow 10.0.0.0/8;
    deny  all;
    proxy_pass http://admintwo_backend;
}