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CVE-2026-57917 is an XML External Entity (XXE) vulnerability in Asseco proCertum SmartSign affecting versions prior to 9.4.3.90. The application parses external XML entities from attacker-crafted signature files. Exploitation can occur during the file preview stage in the file selection window, before the user confirms opening the file. Because external entity resolution is not properly restricted, a crafted XML payload can cause the application to dereference attacker-controlled or local resources. This can lead to server-side request forgery and, depending on the XML parser configuration, disclosure of local file contents.
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No public exploit code observed for this vulnerability.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A reported vulnerability affecting proCertum SmartSign software.
An XML External Entity (XXE) vulnerability in Asseco proCertum SmartSign that enables SSRF and potentially local file read through crafted signature files, triggered during file preview.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.