Security readout for executives and security teams
Plain-English summary
CVE-2026-4001 is a critical flaw in the WooCommerce Custom Product Addons Pro WordPress plugin. On affected sites, an unauthenticated visitor may be able to run code on the server through a vulnerable custom pricing formula configuration. This can lead to full site compromise if the plugin and vulnerable field setup are present.
Executive priority
Treat as urgent for any ecommerce site using this plugin. Prioritize identifying affected stores, removing vulnerable configurations, and applying vendor-approved remediation. The business risk includes site takeover, customer data exposure, payment-flow disruption, and reputational harm.
Technical view
The issue is remote code execution in process_custom_formula() in includes/process/price.php. User-submitted WCPA text field values can reach PHP eval() after insufficient sanitization. The described risky configuration is pricingType: custom using {this.value}. The CVSS 3.1 score is 9.8, with network access, low complexity, no privileges, and no user interaction required.
Likely exposure
Exposure appears limited to WordPress/WooCommerce sites running WooCommerce Custom Product Addons Pro up to and including 5.4.1, with a text field configured for custom pricing formula using user input. Internet-facing ecommerce sites are the highest concern.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. However, the vulnerability is unauthenticated, network-reachable, and high-impact when the vulnerable plugin configuration exists, making rapid assessment appropriate.
Researcher notes
CWE-95 is cited, consistent with eval-based code injection. The CVE source describes the vulnerable function, file path, sanitization gap, and triggering configuration. The affected-version metadata in the bundle is inconsistent, so validate against the CVE narrative and vendor/Wordfence references.
Mitigation direction
- Check vendor and Wordfence guidance for a fixed version or official mitigation.
- Update or disable WooCommerce Custom Product Addons Pro if affected.
- Remove or disable custom pricing formulas using direct user text field values.
- Restrict access to affected product pages until remediation is complete.
- Back up the site before applying plugin or configuration changes.
Validation and detection
- Inventory WordPress sites using WooCommerce Custom Product Addons Pro.
- Confirm installed plugin version, especially versions up to 5.4.1.
- Review product addon fields for custom pricing formulas using user-submitted text values.
- Check web server, PHP, and WordPress logs for suspicious requests or unexpected code execution indicators.
- Verify vendor advisory details before declaring remediation complete.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-95: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-4001 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.