Vulnerabilities in Dayforce ESS Excelity software

CERT Polska has received a report about vulnerabilities in Dayforce ESS Excelity software and participated in coordination of their disclosure.

UPDATE 13.10.2026: The vulnerable product has been updated from Payroll to ESS Excelity. The affected versions have been updated accordingly.

The vulnerabilityCVE-2026-73640: Dayforce ESS Excelity is vulnerable to Time Based-Blind SQL Injection in password recovery functionality. An unauthenticated attacker can prepare GET request with one of the parameters filled in with an arbitrary SQL query. The parameter is interpreted as part of SQL predicate resulting in Time-Based Blind SQL Injection.

This issue was fixed in version V3.

The vulnerabilityCVE-2026-73641: Dayforce ESS Excelity is vulnerable to Reflected XSS in multiple endpoints. An attacker can prepare a specially crafted URL that, when opened, results in arbitrary JavaScript execution in the victim's browser.

This issue was fixed in version V4.

The vulnerabilityCVE-2026-73642: Dayforce ESS Excelity is vulnerable to Path Traversal in file download functionality. An unauthenticated attacker can sent GET request with file path parameter set to any path including an absolute local file path.

This issue was fixed in version V4.

We thank Dawid Dudek (4c1d8urn) for the responsible vulnerability report.