What is CVE-2026-6858?

CVE-2026-6858 is a high-severity vulnerability in Transbank Webpay, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2026-06-22.

How severe is CVE-2026-6858?

High severity. CVSS v3 base score is 7.1 out of 10.

XSS in Transbank Webpay

CVE-2026-6858

The Transbank Webpay WordPress plugin before 1.14.0 does not sanitize and escape logs to be displayed, allowing unauthenticated users to perform Stored XSS attacks against logged in administrator

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-06-22 · last modified 2026-07-22.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.003 (20.0th percentile), scored 2026-10-08.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Transbank Webpay — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

wpscan.com/vulnerability/81035d75-81a5-486a-a9fb-b0d1e0befe3c/ (technical-description, exploit, vdb-entry)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-6858?: CVE-2026-6858 is a high-severity vulnerability in Transbank Webpay, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2026-06-22.
How severe is CVE-2026-6858?: High severity. CVSS v3 base score is 7.1 out of 10.