Security readout for executives and security teams
Plain-English summary
CVE-2021-39308 affects the WooCommerce myghpay Payment Gateway WordPress plugin through version 3.0. A crafted link could make a visitor’s browser run attacker-supplied script if the user follows it. Business impact is usually limited, but it can expose session data or alter page content in a payment-related WordPress context.
Executive priority
Treat this as a moderate-priority web exposure, especially for e-commerce sites using this payment gateway. It is not confirmed actively exploited in the supplied evidence, but payment-page XSS can affect customer trust and should not remain unresolved.
Technical view
The issue is reflected cross-site scripting in the clientref parameter handled by processresponse.php. It is unauthenticated but requires user interaction. CVSS 3.1 is 6.1 with network attack vector, low complexity, changed scope, and low confidentiality and integrity impact.
Likely exposure
Exposure is limited to WordPress sites running WooCommerce myghpay Payment Gateway version 3.0 or earlier. The source bundle does not identify other affected products, CPEs, or a confirmed fixed version.
Exploitation context
The CVE is not listed as CISA KEV in the provided data, and the bundle gives no evidence of active exploitation. Exploitation would depend on convincing a user to open a maliciously crafted payment response URL.
Researcher notes
The key evidence is the CVE description and WordPress Trac reference to processresponse.php. The provided sources establish affected versions through 3.0 and reflected XSS via clientref, but do not provide exploit telemetry, CISA KEV status, or a confirmed patched version.
Mitigation direction
- Inventory WordPress sites for the affected WooCommerce myghpay Payment Gateway plugin.
- Check vendor, WordPress plugin, or Wordfence guidance for a fixed or retired release.
- Disable or remove the plugin where it is not business-critical.
- Use WAF or application filtering as temporary risk reduction for reflected XSS patterns.
- Prioritize replacement if no maintained fixed version is available.
Validation and detection
- Confirm whether any site runs WooCommerce myghpay Payment Gateway version 3.0 or earlier.
- Review plugin files for processresponse.php and handling of the clientref parameter.
- Check web logs for unusual requests to processresponse.php.
- Verify payment workflows still function after plugin update, removal, or replacement.
- Document any compensating controls if a fixed version cannot be confirmed.
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-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.
Open ATT&CK lookupCVE-2021-39308 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
- Medium
- CVSS
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39308CVE reference · x_refsource_MISC
- https://plugins.trac.wordpress.org/browser/woo-myghpay-payment-gateway/trunk/processresponse.php?rev=2410420#L134CVE reference · x_refsource_MISC
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.
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.