# CVE-2026-56843

## Summary

- **CVE ID:** CVE-2026-56843
- **Severity:** CRITICAL
- **CVSS Score:** 9.9 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)
- **CWE:** CWE-522
- **Published:** Jul 8, 2026
- **Last Modified:** Jul 8, 2026

## Description

Incorrect authorization in the XML-RPC API of WebPros Plesk before 18.0.78.4 allows a low-privileged authenticated customer to look up domains they do not own, because ownership is enforced only for certain lookup filters and schema validation is bypassed for legacy protocol versions. This results in cross-tenant disclosure of other tenants' FTP credentials stored in cleartext, which can be leveraged to execute code as another tenant's system user.

## Affected Products

- Webpros — Plesk (10.4)

## References

- [CNA](https://support.plesk.com/hc/en-us/articles/41178305151255-Vulnerability-in-Plesk-XML-API-Cleartext-FTP-Password-Exposure)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.66%
- **EPSS Percentile:** 49.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._