What is Insufficient Psychological Acceptability (CWE-655)?

TL;DR: Insufficient Psychological Acceptability (CWE-655) is a vulnerability where protection mechanisms are too difficult for users, leading them to disable these protections. To fix it, design security features that are user-friendly and intuitive.

What is Insufficient Psychological Acceptability?

Insufficient Psychological Acceptability (CWE-655) is a type of security weakness that occurs when protection mechanisms are too difficult or inconvenient for users to use, leading them to disable these protections. As defined by the MITRE Corporation under CWE-655, and classified by the OWASP Foundation without a direct mapping.

Quick Summary

Insufficient Psychological Acceptability poses significant risks because it leads users to bypass security measures that protect against unauthorized access or data breaches. This can leave systems vulnerable to attacks due to weakened protection mechanisms. Jump to: [Overview] · [How It Works] · [Business Impact] · [Attack Scenario] · [Detection] · [Remediation] · [Framework-Specific Fixes] · [Ask AI] · [Best Practices] · [FAQ] · [Related Vulnerabilities]

Jump to: Quick Summary · Insufficient Psychological Acceptability Overview · How Insufficient Psychological Acceptability Works · Business Impact of Insufficient Psychological Acceptability · Insufficient Psychological Acceptability Attack Scenario · How to Detect Insufficient Psychological Acceptability · How to Fix Insufficient Psychological Acceptability · Framework-Specific Fixes for Insufficient Psychological Acceptability · How to Ask AI to Check Your Code for Insufficient Psychological Acceptability · Insufficient Psychological Acceptability Best Practices Checklist · Insufficient Psychological Acceptability FAQ · Vulnerabilities Related to Insufficient Psychological Acceptability · References · Scan Your Own Site

Insufficient Psychological Acceptability Overview

What: A security weakness where protection mechanisms are too difficult or inconvenient for users, leading them to disable these protections.

Why it matters: It can lead to systems being left in less secure states and more susceptible to attacks due to bypassed protections.

Where it occurs: In any system with a protection mechanism that is overly complex or cumbersome for users.

Who is affected: Any user of the application who finds security mechanisms too difficult to use, leading them to disable these protections.

Who is NOT affected: Systems where security mechanisms are intuitive and do not hinder user experience.

How Insufficient Psychological Acceptability Works

Root Cause

The root cause lies in designing protection mechanisms that users find too cumbersome or inconvenient. This leads users to disable the mechanism either intentionally or unintentionally, leaving systems vulnerable.

Attack Flow

1. User encounters a security mechanism.
2. The mechanism is perceived as difficult or inconvenient.
3. User decides to bypass or disable the mechanism.
4. System remains unprotected due to disabled mechanism.

Prerequisites to Exploit

• A protection mechanism that users find too cumbersome or inconvenient.
• Users who are likely to disable such mechanisms when faced with inconvenience.

Vulnerable Code

def login():
    # Complex and difficult-to-use security mechanism
    if not user.is_secure():
        print("Security check failed")

This code demonstrates a complex security mechanism that users may find too cumbersome, leading them to bypass it.

Secure Code

def login():
    # Intuitive and seamless security mechanism
    if not user.is_secure():
        raise ValueError("Security check failed")
    else:
        print("Login successful")

This code ensures a more intuitive and seamless security mechanism that does not hinder user experience, thereby reducing the likelihood of it being disabled.

Business Impact of Insufficient Psychological Acceptability

Confidentiality: Data access can be compromised if users disable protection mechanisms designed to prevent unauthorized access.

• Example: Users bypassing two-factor authentication due to perceived inconvenience.

Integrity: System integrity may be compromised if security measures are disabled, leading to potential data tampering or corruption.

• Example: Users disabling file permissions that protect against unauthorized modifications.

Availability: Systems may become unavailable or suffer performance degradation if users disable critical protection mechanisms.

• Example: Users bypassing rate-limiting protections designed to prevent denial-of-service attacks.

Business Consequences

1. Financial losses due to data breaches and system downtime.
2. Non-compliance with regulatory requirements leading to fines and legal action.
3. Damage to reputation and customer trust following security incidents.

Insufficient Psychological Acceptability Attack Scenario

1. User encounters a complex login verification process.
2. The user finds the mechanism too cumbersome or inconvenient.
3. The user disables or bypasses the protection mechanism.
4. Unauthorized access occurs due to disabled protections.
5. Sensitive data is compromised, leading to a security breach.

How to Detect Insufficient Psychological Acceptability

Manual Testing

• Conduct usability studies and gather feedback from users on the ease of use for security mechanisms.
• Evaluate whether protection mechanisms are intuitive and do not hinder user experience.
• Test if users disable or bypass protections due to perceived inconvenience.

Automated Scanners (SAST/DAST)

Static analysis can identify complex or cumbersome security mechanisms, while dynamic testing can simulate user behavior to detect disabling of protections.

PenScan Detection

PenScan’s scanner engines such as ZAP and Wapiti can flag protection mechanisms that are too difficult for users to use.

False Positive Guidance

A real vulnerability occurs when a mechanism is genuinely perceived as too cumbersome by users, leading them to disable it. A false positive would occur if the mechanism was actually easy to use but flagged due to complexity in code structure.

How to Fix Insufficient Psychological Acceptability

• Design security mechanisms that are intuitive and do not hinder user experience.
• Provide clear feedback when unexpected results occur due to security decisions.
• Perform usability studies and gather user feedback on protection mechanisms.
• Ensure seamless integration of security features into the overall system design.

Framework-Specific Fixes for Insufficient Psychological Acceptability

React/Next.js

function PasswordField() {
  const [visible, setVisible] = useState(false);
  return (
    <div>
      <input type={visible ? 'text' : 'password'} />
      <button type="button" onClick={() => setVisible(v => !v)}>{visible ? 'Hide' : 'Show'} password</button>
    </div>
  );
}

Django (server-rendered)

# Instead of forcing a rigid, hard-to-remember password policy that pushes
# users toward writing passwords down, use a strength meter that guides
# without blocking:
def validate_password_strength(request):
    score = zxcvbn(request.POST['password'])['score']
    return JsonResponse({'score': score, 'feedback': 'Consider a longer passphrase' if score < 3 else 'Strong'})

Both patterns keep the security control (password confirmation, strength enforcement) but reduce the friction that would otherwise tempt users to work around it — showing the password on request instead of forcing blind re-entry, and guiding toward a strong password instead of rejecting attempts with only an error message.

How to Ask AI to Check Your Code for Insufficient Psychological Acceptability

Insufficient Psychological Acceptability Best Practices Checklist

✅ Design seamless protection mechanisms that do not hinder user experience. ✅ Provide clear feedback when unexpected results occur due to security decisions. ✅ Conduct usability studies and gather user feedback on protection mechanisms. ✅ Ensure seamless integration of security features into the overall system design. ✅ Test if users disable or bypass protections due to perceived inconvenience.

Insufficient Psychological Acceptability FAQ

How does Insufficient Psychological Acceptability work?

It occurs when a product’s security mechanism is difficult or inconvenient to use, leading users to disable it inadvertently or intentionally.

What are the common consequences of Insufficient Psychological Acceptability?

Users might bypass protection mechanisms, leaving systems in less secure states and more susceptible to compromise.

How can you detect Insufficient Psychological Acceptability in your codebase?

Perform human factors studies and usability testing to identify where security mechanisms are hard to use or understand.

What is the root cause of Insufficient Psychological Acceptability?

The primary issue lies in designing security features that users find too cumbersome, leading them to disable these protections.

How do you mitigate Insufficient Psychological Acceptability?

Design seamless security mechanisms and provide clear feedback when unexpected results occur due to security decisions.

What are the business impacts of Insufficient Psychological Acceptability?

Systems may become vulnerable to unauthorized access, data breaches, and compliance violations if users disable necessary protections.

How can developers prevent Insufficient Psychological Acceptability in their applications?

Ensure that security mechanisms are intuitive and do not hinder user experience, thereby reducing the likelihood of them being disabled.

Vulnerabilities Related to Insufficient Psychological Acceptability

References

• MITRE CWE-655
• CAPEC-None
• NVD

Scan Your Own Site

Manual code review catches what you know to look for. An automated scan catches what you didn’t. Scan your own website using PenScan to find Insufficient Psychological Acceptability and other risks before an attacker does.