CVE-2026-7195

Executive Summary

CVE-2026-7195 is a critical Improper Input Validation vulnerability (CWE-20) affecting Progress Sitefinity, a popular .NET-based web content management system (CMS). The flaw resides in the web services layer and allows a remote, unauthenticated attacker to compromise the integrity and confidentiality of user accounts. Successful exploitation requires user interaction (e.g., clicking a crafted link) and a non-default site configuration, which reduces the attack surface but does not eliminate the risk. The CVSS score of 8.8 (High) reflects the severe impact on confidentiality and integrity, though availability is not directly affected.

The vulnerability affects multiple version lines of Sitefinity from 14.1.x through 15.4.x, with specific patched versions provided by Progress. No public proof-of-concept (PoC) or exploit code has been released at this time, and the EPSS score is 0.0%, indicating low exploitation likelihood in the wild. However, given the critical nature and the potential for account takeover, immediate patching is strongly recommended.

Supply Chain & Package Security

Sitefinity is a commercial .NET CMS distributed via NuGet packages and installer binaries. Organizations should verify the integrity of downloaded patches using official checksums provided by Progress. The vulnerability does not directly affect open-source packages, but the underlying .NET runtime and dependencies should be kept up to date to mitigate chained attacks.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
• Base Score: 8.8 (High)
• Attack Vector (AV): Network – The vulnerability is exploitable remotely.
• Attack Complexity (AC): Low – No special conditions required beyond user interaction.
• Privileges Required (PR): None – No authentication needed.
• User Interaction (UI): Required – The victim must perform an action (e.g., click a link).
• Scope (S): Unchanged – The vulnerable component and the impacted component are the same.
• Confidentiality (C): High – Full account data compromise possible.
• Integrity (I): High – Attacker can modify account details or impersonate users.
• Availability (A): None – No direct denial-of-service impact.

Threat Level: High. While user interaction is required, the lack of authentication and the potential for account takeover make this a priority for remediation.

Deep Dive & Mechanics

The vulnerability stems from improper input validation in Sitefinity’s web services endpoints. These endpoints handle user account operations such as registration, profile updates, or password resets. By crafting a malicious request with specially manipulated parameters, an attacker can bypass validation checks and perform actions on behalf of other users or escalate privileges.

The non-default site configuration requirement suggests that the vulnerable code path is only active when certain features (e.g., custom authentication providers, extended user profile fields, or third-party integrations) are enabled. This reduces the number of exploitable instances but does not eliminate the risk for affected deployments.

The attack flow typically involves:

1. An attacker identifies a Sitefinity instance with a non-default configuration (e.g., via Shodan dorks).
2. The attacker crafts a malicious link or form submission that targets a vulnerable web service.
3. The victim (e.g., an authenticated user or administrator) interacts with the crafted request.
4. The server processes the input without proper validation, allowing the attacker to modify account attributes, reset passwords, or gain unauthorized access.

Vulnerable vs. Patched Code

Since no public code diff is available, the following is a hypothetical example based on typical CWE-20 patterns in .NET web services.

Vulnerable Code (C#):

[WebMethod]
public bool UpdateUserProfile(string userId, string email, string role)
{
    // No validation of userId or role
    User user = UserManager.GetUser(userId);
    user.Email = email;
    user.Role = role;
    UserManager.Update(user);
    return true;
}

Patched Code (C#):

[WebMethod]
public bool UpdateUserProfile(string userId, string email, string role)
{
    // Validate that the current user is authorized to modify this profile
    if (!User.IsInRole("Admin") && User.Id != userId)
        throw new UnauthorizedAccessException();

    // Validate email format
    if (!Regex.IsMatch(email, @"^[^@\s]+@[^@\s]+\.[^@\s]+$"))
        throw new ArgumentException("Invalid email");

    // Validate role against allowed list
    string[] allowedRoles = { "User", "Editor", "Admin" };
    if (!allowedRoles.Contains(role))
        throw new ArgumentException("Invalid role");

    User user = UserManager.GetUser(userId);
    user.Email = email;
    user.Role = role;
    UserManager.Update(user);
    return true;
}

The patched version adds authorization checks, input validation, and whitelisting to prevent unauthorized modifications.

Exploitation & Lab Setup

Red Team (Attack Simulation)

Prerequisites:

• A vulnerable Sitefinity instance (e.g., version 15.0.0 with non-default configuration).
• A victim user account (simulated).
• Knowledge of the vulnerable endpoint (e.g., /Sitefinity/Services/UserService.svc/UpdateProfile).

Exploitation Steps:

1. Reconnaissance: Use Shodan or manual browsing to identify Sitefinity instances. Look for endpoints like /Sitefinity/Services/.
2. Craft Malicious Request: Create a POST request with manipulated parameters. Example using curl:

   curl -X POST "https://target.com/Sitefinity/Services/UserService.svc/UpdateProfile" \
   -H "Content-Type: application/json" \
   -d '{"userId":"victim-id","email":"attacker@evil.com","role":"Admin"}'
   

3. Deliver Payload: Send a phishing email to the victim containing a link that triggers the request (e.g., via a hidden form submission or XSS).
4. Escalate: Once the victim interacts, the attacker gains admin-level access to the account.

Note: No public exploit code is available; this is a hypothetical scenario.

Blue Team (Defense & Detection)

Detection Steps:

1. Monitor Web Service Logs: Look for unusual POST requests to /Sitefinity/Services/*.svc with unexpected parameters.
2. User Behavior Analytics: Alert on sudden changes to user roles or email addresses, especially if performed by non-admin users.
3. Network Traffic Analysis: Detect anomalous JSON payloads in HTTP requests to Sitefinity endpoints.

Honeypot Strategy:

• Deploy a decoy Sitefinity instance with a fake admin account. Monitor for any attempts to modify the account via web services.

Indicators of Compromise (IOCs)

• Network IOCs:
  • POST requests to /Sitefinity/Services/*.svc with JSON bodies containing "role":"Admin" or "email":"*@*" from unexpected IPs.
  • Unusual User-Agent strings (e.g., curl/7.x, python-requests/2.x).
• Host IOCs:
  • Sitefinity logs showing UpdateUserProfile or similar methods called without proper authentication.
  • New user accounts with elevated privileges created outside normal business hours.
• File IOCs:
  • Modified App_Data/Sitefinity/ configuration files indicating unauthorized changes.

Detection Engineering

YARA Rule

rule CVE_2026_7195_Sitefinity_WebService_Exploit {
    meta:
        description = "Detects malicious POST requests targeting Sitefinity web services"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2026-7195"
    strings:
        $s1 = "/Sitefinity/Services/" ascii wide nocase
        $s2 = "UpdateUserProfile" ascii wide nocase
        $s3 = "\"role\":\"Admin\"" ascii wide
        $s4 = "\"email\":" ascii wide
    condition:
        all of ($s1, $s2) and any of ($s3, $s4)
}

Sigma Rule

title: CVE-2026-7195 Sitefinity Web Service Exploitation
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects exploitation attempts against CVE-2026-7195 in Progress Sitefinity
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: iis
detection:
    selection:
        cs-uri-stem|contains: '/Sitefinity/Services/'
        cs-method: 'POST'
        cs-uri-query|contains: 'UpdateUserProfile'
    condition: selection
falsepositives:
    - Legitimate administrative actions
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2026-7195 Sitefinity Web Service Exploitation Attempt";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/Sitefinity/Services/"; http_uri;
    content:"UpdateUserProfile"; http_uri;
    content:"\"role\":\"Admin\""; http_client_body;
    classtype:attempted-admin;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Patch: Upgrade Sitefinity to the latest patched version for your release line:
   • 14.4.x → 14.4.8152
   • 15.0.x → 15.0.8234
   • 15.1.x → 15.1.8335
   • 15.2.x → 15.2.8441
   • 15.3.x → 15.3.8531
   • 15.4.x → 15.4.8630
2. Disable Unused Features: If the vulnerable web services are not required, disable them via Sitefinity’s administration panel.
3. Web Application Firewall (WAF): Deploy WAF rules to block requests containing suspicious JSON payloads targeting /Sitefinity/Services/.

Long-Term Mitigations:

• Implement strict input validation and authorization checks in custom web services.
• Conduct regular security audits of Sitefinity configurations.
• Enable multi-factor authentication (MFA) for all administrative accounts.
• Monitor logs for anomalous web service calls.

Workaround: If patching is not immediately possible, restrict network access to Sitefinity web services to trusted IP ranges only.

Valters IT