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PatchSiren cyber security CVE debrief

CVE-2026-6858 Transbank CVE debrief

CVE-2026-6858 is a Stored XSS vulnerability in the Transbank Webpay WordPress plugin before 1.14.0. The plugin fails to sanitize and escape logs for display, allowing unauthenticated users to perform Stored XSS attacks against logged-in administrators. This issue has a potential impact on WordPress sites using the affected plugin version. The vulnerability's CVSS score and severity are not provided. Defenders should prioritize patching or mitigating this vulnerability to prevent potential attacks.

Vendor
Transbank
Product
Webpay WordPress plugin
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-22
Original CVE updated
2026-07-22
Advisory published
2026-06-22
Advisory updated
2026-07-22

Who should care

Administrators and security teams responsible for WordPress sites using the Transbank Webpay plugin should be aware of this vulnerability. Specifically, those with sites using plugin versions before 1.14.0 are at risk and should take immediate action to patch or mitigate the vulnerability.

Technical summary

The Transbank Webpay WordPress plugin before 1.14.0 does not properly sanitize and escape logs for display. This oversight allows unauthenticated users to inject malicious scripts (Stored XSS) that can be executed by logged-in administrators when they view the logs. The vulnerability's CVSS score and severity are not provided, but its potential impact on WordPress sites using the affected plugin version is significant.

Defensive priority

High priority due to potential for unauthenticated Stored XSS attacks against administrators.

Recommended defensive actions

  • Update the Transbank Webpay WordPress plugin to version 1.14.0 or later.
  • Review logs for potential malicious activity.
  • Implement additional monitoring for suspicious administrator actions.
  • Consider temporarily disabling the plugin if immediate patching is not possible.
  • Verify the plugin's configuration and ensure proper logging practices.

Evidence notes

The CVE-2026-6858 record indicates a Stored XSS vulnerability in the Transbank Webpay WordPress plugin before 1.14.0. The vulnerability allows unauthenticated users to perform Stored XSS attacks against logged-in administrators. Evidence is based on a single source reference from WPScan (https://wpscan.com/vulnerability/81035d75-81a5-486a-a9fb-b0d1e0befe3c/). Defenders should verify the plugin version and update to 1.14.0 or later.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-6858 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-6858

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-6858 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-6858

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.