CVE-2026-6858 Transbank Webpay < 1.14.0 - Unauthenticated Stored XSS
Unauthenticated attackers can inject malicious scripts into logs, leading to stored XSS and potential administrator account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-6858?
CVE-2026-6858 is a high-severity cross-site scripting vulnerability in Unknown Transbank Webpay, published on 22 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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
Weakness: CWE-79
Which versions are affected by CVE-2026-6858?
How do I fix CVE-2026-6858?
No fix has been published for CVE-2026-6858 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-6858 being exploited?
There is no known exploitation of CVE-2026-6858 in the wild and no public exploit code.
Sources
Also known as GHSA-4c54-mjrj-jwj4.