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CVE Record

CVE-2026-3231: Checkout Field Editor (Checkout Manager) for WooCommerce <= 2.1.7 - Unauthenticated Stored Cross-Site Scripting via Block Checkout Custom Radio Field

The Checkout Field Editor (Checkout Manager) for WooCommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via custom radio and checkboxgroup field values submitted through the WooCommerce Block Checkout Store API in all versions up to, and including, 2.1.7. This is due to the `prepare_single_field_data()` method in `class-thwcfd-block-order-data.php` first escaping values with `esc_html()` then immediately reversing the escaping with `html_entity_decode()` for radio and checkboxgroup field types, combined with a permissive `wp_kses()` allowlist in `get_allowed_html()` that explicitly permits the `<select>` element with the `onchange` event handler attribute. This makes it possible for unauthenticated attackers to inject arbitrary web scripts via the Store API checkout endpoint that execute when an administrator views the order details page.

HighCVSS 7.2Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-3231 affects a WordPress WooCommerce checkout-field plugin. An unauthenticated shopper could submit malicious script through certain custom checkout fields. That script is stored with the order and can run when an administrator opens order details, creating risk to admin sessions and store integrity.

Executive priority

Treat as a high-priority ecommerce administration risk. It does not directly prove payment-card compromise, but it can execute attacker-controlled script in an administrator’s browser and may enable account or store-management abuse.

Technical view

The issue is stored XSS in Checkout Field Editor (Checkout Manager) for WooCommerce up to 2.1.7. Radio and checkboxgroup values submitted through the WooCommerce Block Checkout Store API are mishandled by escaping and then decoding, while allowed HTML permits risky event attributes. Execution occurs in the admin order details context.

Likely exposure

Exposure is likely on WordPress WooCommerce stores using this plugin at version 2.1.7 or earlier, especially with Block Checkout and custom radio or checkboxgroup fields enabled.

Exploitation context

The reported attack path is unauthenticated and network-reachable through checkout submission. The CVE is not listed as CISA KEV in the provided data, and no provided source confirms active exploitation.

Researcher notes

Public details identify specific vulnerable code paths and a related WordPress Trac changeset. Avoid assuming broad exploitation beyond the described Store API checkout path. Confirm exact fixed version from vendor or plugin repository before closing findings.

Mitigation direction

  • Check vendor and WordPress plugin guidance for the fixed release.
  • Upgrade the plugin if a version newer than the affected range is available.
  • If immediate upgrade is unavailable, assess disabling affected custom checkout fields.
  • Limit administrator access to order pages until remediation is complete.
  • Review WAF or security-plugin coverage for stored XSS attempts.

Validation and detection

  • Inventory all WooCommerce sites for the plugin and installed version.
  • Confirm whether WooCommerce Block Checkout is in use.
  • Identify custom radio and checkboxgroup checkout fields.
  • Review recent orders for unexpected HTML or event-handler content.
  • Verify remediation by confirming the vulnerable version is no longer installed.
Prepared
Confidence
high
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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.

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cve · low confidence lookup

CVE-2026-3231 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.2 (3.1)
Known Exploited
No
Published

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

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
7Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
7.2CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N3.92.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.2High
CVSS 3.1 vector shape for CVE-2026-3231Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
themehighCheckout Field Editor (Checkout Manager) for WooCommerce0unaffected
Weakness

CWE details

CWE-79

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-79 · source CWE mapping

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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