Plugin Name	Cost Calculator Builder
Type of Vulnerability	Broken Access Control
CVE Number	CVE-2025-14755
Urgency	Low
CVE Publish Date	2026-05-13
Source URL	CVE-2025-14755

Urgent Security Advisory: Broken Access Control in Cost Calculator Builder (≤ 4.0.1) — Essential Guidance for WordPress Site Operators

Author: Managed-WP Security Team
Date: 2026-05-13

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Executive Summary

A critical broken access control vulnerability, officially tracked as CVE-2025-14755, affects the Cost Calculator Builder plugin for WordPress versions up to 4.0.1. This security gap allows any unauthenticated user to manipulate pricing data due to insecure direct object references (IDOR). Although classified with a low severity rating (CVSS 5.3), its impact on revenue, fraud risk, and site integrity—especially for businesses using online calculators or quoting tools—is significant. The plugin developer has released a patch in version 4.0.2. This article provides an in-depth analysis of the issue, attack scenarios, detection indicators, mitigation strategies, and how Managed-WP fortifies your defenses while you update.

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Understanding the Risk (Plain Terms)

If your WordPress site uses Cost Calculator Builder for quotes, estimates, or pricing calculators, attackers can exploit this vulnerability without authentication. This means they can:

• Alter displayed or submitted prices in unauthorized ways,
• Submit manipulated quotes or orders at reduced or zero cost,
• Exploit flaws to gain free services or discounts, and
• Potentially compromise other site parts trusting these manipulated values downstream.

Low severity on paper does not equate to low risk in reality; businesses relying on pricing accuracy are exposed to financial and reputational harm without swift action.

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Technical Breakdown of the Vulnerability

• Affected Versions: Cost Calculator Builder plugin, versions ≤ 4.0.1
• Patched Version: 4.0.2
• Vulnerability Type: Broken Access Control with Insecure Direct Object Reference (IDOR)
• CVE Identifier: CVE-2025-14755
• Exploitation Privilege: None (no authentication required)

The plugin exposes API endpoints—via AJAX, REST, or form handlers—that do not adequately verify:

1. The caller’s identity and permissions, and
2. That the manipulated object IDs (such as quote_id or calculator_id) belong to the requesting user/session.

Without these checks, unauthenticated attackers can arbitrarily modify pricing data, resulting in unauthorized price manipulation.

Note: We deliberately do not disclose exploit code here, focusing instead on actionable defense.

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Potential Threat Scenarios

Real-world attack vectors include:

• Quote Price Manipulation: Attackers lower the price of quotes to minimal or zero amounts, and then use these manipulated quotes to secure services or products fraudulently, assuming backend systems don’t revalidate prices.
• Checkout Fraud: Calculators affecting order totals can be manipulated to reduce payment amounts, allowing unauthorized purchases.
• Bulk Exploitation: Automation of numerous requests to alter multiple pricing instances, maximizing fraudulent gains.
• Reputational Damage: Display of incorrect pricing (e.g., negative or bizarrely low prices) can confuse customers and undermine trust.

Besides financial impacts, such attacks incur operational costs including investigations, refund processing, and potential legal obligations.

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How to Detect If Your Site Has Been Targeted

Look for these warning signs in your logs and administrative interface:

• Unexpected or illogical changes in pricing or quotes stored in your database.
• Orders or requests showing zero or suspiciously low totals.
• Unusual access patterns targeting calculator-related endpoints from unfamiliar IPs or IP ranges.
• High frequency of POST requests to pricing APIs from limited IPs (potential automated abuse).
• Unexpected administrative alerts, confirmation emails, or new entries inconsistent with normal user behavior.
• Audit trails indicating modifications by unauthenticated sources (if available).

If these anomalies occur, treat your site as potentially compromised and proceed with incident measures immediately.

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Immediate Mitigation Steps

1. Update the Plugin:
   • Apply the official patch by upgrading Cost Calculator Builder to version 4.0.2 or later immediately.
   • If possible, test the update on a staging environment prior to production deployment, but do not delay patching in production for long.
2. Disable the Plugin Temporarily:
   • If an immediate update is not feasible, deactivate the plugin to eliminate vulnerable endpoints from exposure.
3. Apply Endpoint Access Restrictions:
   • Use temporary firewall or web server rules to restrict access to plugin API endpoints only to trusted IPs or authenticated users.
   • Example tactics include blocking POST requests to plugin PHP files or enforcing authentication cookies.
   • These are stop-gap measures pending patch deployment.
4. Harden Application Logic:
   • Ensure any calculation or pricing forms perform server-side recomputation of values instead of trusting client input.
5. Implement Rate Limiting and Bot Protection:
   • Limit excessive or automated requests, and deploy CAPTCHA where applicable on pricing submission endpoints.
6. Monitor Logs and Enable Alerts:
   • Set up monitoring to detect surges of suspicious activity targeting calculator or quote endpoints.

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Recommended Firewall Controls by Managed-WP

While the official patch is paramount, Managed-WP’s Web Application Firewall (WAF) can protect your site from this vulnerability during the update process. Key rule applications include:

• Block Unauthenticated Price Updates:
  • Requests to update pricing or quote data via AJAX or REST endpoints without a valid WordPress login cookie or token are blocked.
• Filter Invalid Price Values:
  • Requests submitting zero or negative price values trigger blocking and logging.
• Prevent IDOR Attacks:
  • Requests where the session cookie does not match the owner of the object being modified are challenged or blocked.
• Rate Limit Enumeration Attacks:
  • Excessive requests from a single IP over multiple quote or calculator IDs are limited or blocked.
• Enforce Proper Headers and Tokens:
  • Requests missing expected nonce or header values are blocked to prevent CSRF and tampering.

Managed-WP also provides virtual patching capabilities, deploying application-level rules at the firewall to shrink your attack surface until official updates are installed.

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Post-Update Validation

After upgrading to version 4.0.2 or above, confirm your site security with these steps:

1. Test in Staging and Production:
   • Verify quote generation, price calculations, and checkout workflows function correctly.
   • Confirm server-side pricing matches expectations.
   • Ensure only authenticated, authorized users can update pricing data.
2. Monitor Logs for Malicious Attempts:
   • Keep WAF logging operational for several weeks to identify lingering attack attempts.
   • Investigate any suspicious successful requests prior to patching.
3. Validate Database Integrity:
   • Audit quotes, orders, and pricing records for anomalies or fraud evidence.
   • Follow Incident Response plans if issues identified.
4. Rotate Credentials:
   • Change any exposed API keys, admin passwords, or related secrets.

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Incident Response Protocol

If exploitation is suspected, follow these critical steps without delay:

1. Containment:
   • Deactivate or isolate the vulnerable plugin and block endpoint access.
   • Consider putting the site into maintenance mode if fraud continues.
2. Evidence Preservation:
   • Secure logs, database snapshots, and plugin audit trails for forensic analysis.
   • Make read-only backups to avoid evidence tampering.
3. Scope Assessment:
   • Identify affected quotes, orders, or user accounts impacted by manipulation.
   • Estimate financial and data exposure.
4. Remediation:
   • Remove or correct fraudulent database records.
   • Restore from clean backups if feasible.
   • Rotate credentials and apply all security patches.
5. Communication:
   • Notify impacted customers, internal staff, and regulatory bodies as appropriate.
   • Provide transparency around remediation efforts and any directions for affected parties.
6. Prevention & Review:
   • Conduct a post-mortem analysis to identify process gaps.
   • Implement continuous monitoring, update policies, and strengthen defenses.

When in doubt, consult cybersecurity professionals or trusted WordPress security providers for assistance.

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Developer Advice: Secure Coding Practices

Plugin developers should adhere to the following principles to avoid similar vulnerabilities:

• Never rely on client-submitted data for critical pricing or order values; always perform server-side recomputation.
• Enforce strict authorization checks (e.g., current_user_can() calls, nonce validation, and CSRF tokens).
• Avoid exposing raw object IDs that are easily enumerated or manipulated; map to internal identifiers securely.
• Sanitize and validate all inputs rigorously, rejecting invalid or suspicious values.
• Maintain logs and audit trails for price and quote changes for post-incident investigation.
• Use rate limiting, CAPTCHA, and bot mitigation on form and API endpoints involving pricing or quoting.
• Incorporate threat modeling and automated security scanning into development cycles.

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Site Owner Quick-Reference Checklist

Within hours:

• Upgrade Cost Calculator Builder to version 4.0.2 or higher.
• Deactivate the plugin if immediate patching isn’t possible.
• Enable firewall rules to block unauthenticated access to pricing endpoints.
• Monitor logs for suspicious pricing changes or access patterns.
• Configure CAPTCHA or rate limiting on vulnerable forms.

Within 1–3 days:

• Verify server-side price computations and order validation.
• Audit database for suspicious orders or quote records.
• Rotate administrative and API credentials where needed.

Ongoing:

• Keep all plugins and themes updated promptly.
• Use managed firewall and security scanning services.
• Maintain tested backup and recovery procedures.
• Strengthen access control and data validation across custom integrations.

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Example WAF Rule Patterns (Conceptual)

Consider deploying these types of filters via your firewall or WAF management console. Managed-WP provides ready-made rules to streamline this process:

• Block unauthenticated POST requests to calculator endpoints:
  • Condition: request path matches calculator endpoint AND method is POST AND no valid auth cookie → BLOCK
• Block suspicious price inputs:
  • Condition: request body includes price ≤ 0 or below expected minimum → BLOCK + LOG
• Limit enumeration attempts:
  • Condition: > 50 distinct quote_id values requested by the same IP in 10 minutes → RATE LIMIT or BLOCK
• Enforce expected request headers:
  • Condition: POST requests missing nonce or X-Requested-With header → CHALLENGE (CAPTCHA) or BLOCK

Note: Implementation details vary by platform. Managed-WP’s security experts can configure and maintain these protections for you.

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Why Patching Remains Critical Despite Firewall Protection

A WAF is a vital line of defense but cannot replace fixing root cause code issues. Virtual patching and firewall filters reduce immediate risk but do not eliminate all attack vectors or logic flaws. Always prioritize applying official vendor patches alongside layered security controls for long-term safety.

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Managed-WP’s Commitment to Security Incident Response

As a trusted U.S.-based WordPress security provider, Managed-WP takes swift, proactive steps to protect your business:

• Rapid deployment of WAF rules for immediate virtual patching.
• Expert guidance on vulnerability mitigation and plugin updates.
• 24/7 monitoring for attempted exploitation and alerts.
• Assistance with investigation and recovery during incidents.

If you’re a Managed-WP customer, our team applies safeguards seamlessly while you update plugins to minimize operational impact.

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Top Priorities for Busy WordPress Site Operators

1. Patch Cost Calculator Builder to version 4.0.2 or newer immediately.
2. If patching isn’t feasible immediately, deactivate the plugin and enable Managed-WP firewall rules blocking exposure.
3. Monitor system and access logs closely, scanning for suspicious activity related to price manipulations.
4. Deploy defensive measures such as virtual patching, rate limiting, and enforce server-side validation.
5. Engage WordPress security professionals or use Managed-WP’s services to ensure full remediation and prevention.

Even minor plugin security flaws can lead to outsized damage. Staying current on updates combined with layered defenses and tested incident response plans are your best protection.

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For assistance with immediate firewall rule implementation or rapid site assessments, Managed-WP’s expert security team stands ready. Start with your free plan for essential protections and contact us for proactive support solutions tailored to your needs.

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