CVE-2024-4787

Cost Calculator Builder PRO <= 3.1.75 - Unauthenticated Arbitrary Email Sending

2024-06-18 00:00

Strategic Overview

Status: Patched in 3.1.76
Affected Plugin: Cost Calculator Builder PRO
Affected Version: <= 3.1.75
CVSS: 5.8Medium
Weakness type: CWE-20 · Improper Input Validation
CVE: CVE-2024-4787

View all Cost Calculator Builder PRO vulnerabilities

At a glance

CVE-2024-4787 is a medium-severity Improper Input Validation vulnerability in the Cost Calculator Builder PRO WordPress plugin, affecting versions <= 3.1.75. It carries a CVSS score of 5.8 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 3.1.76; sites on affected versions should update now. Disclosed June 2024, reported by István Márton.

Vulnerability Overview

The Cost Calculator Builder PRO for WordPress is vulnerable to arbitrary email sending vulnerability in versions up to, and including, 3.1.75. This is due to insufficient limitations on the email recipient and the content in the 'send_pdf' and the 'send_pdf_front' functions which are reachable via AJAX. This makes it possible for unauthenticated attackers to send emails with any content to any recipient.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-20: Improper Input Validation

Cost Calculator Builder PRO <= 3.1.75 carries this weakness at send_pdf, and reaching it takes no account at all. Improper input validation means the application accepts input without confirming it has the form, type or range the code downstream assumes.

The concrete impact depends on where the unvalidated value lands, which is why records in this class range from cosmetic bugs to full compromise. For Cost Calculator Builder PRO the fix is 3.1.76: builds <= 3.1.75 are affected, anything from 3.1.76 onward is not.

Remediation

Update to version 3.1.76, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Cost Calculator Builder PRO 3.1.76 closes this, and updating the plugin is the step that ends it.

Firewall
Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2024-4787 https://www.wordfence.com/threat-intel/vulnerabilities/id/035ada56-541d-47b3-8348-3401d94bb509 https://nvd.nist.gov/vuln/detail/CVE-2024-4787

Related records

Other vulnerabilities in Cost Calculator Builder PRO

CVSS Vector

5.8

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeChanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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