What’s Vulnerable › Vulnerabilities

CVE-2026-57917: Improper Restriction of XML External Entity Reference in proCertum SmartSign

• Severity: medium (CVSS 4.8 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-27 · updated 2026-10-24
• Weakness: CWE-611

Description

proCertum SmartSign parses external XML entities from arbitrary crafted signature files, enabling SSRF and potentially allowing the reading of local files, depending on the parser's configuration. The XML External Entity (XXE) vulnerability is triggered simply by previewing a file in the file selection window, before the victim clicks “Open”. This issue was fixed in version 9.4.3.90.

Affected products

• Asseco proCertum SmartSign: before 9.4.3.90 — fixed in 9.4.3.90

How to fix

Upgrade to a fixed version: Asseco proCertum SmartSign 9.4.3.90. Check the vendor advisory for mitigations.

References

• https://cert.pl/posts/2026/07/CVE-2026-57916
• https://pomoc.certum.pl/pl/oprogramowanie/procertum-smartsign/

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