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CVE-2026-57916 is a vulnerability in Asseco proCertum SmartSign affecting versions prior to 9.4.3.90. The application opens the Certificate Practice Statement (CPS) URI embedded in a certificate without validating the URI schema. An attacker can create a certificate containing a CPS URI that references a local executable or an arbitrary web resource, use that certificate to sign a document, and deliver the signed document to a victim. When the victim opens the document in proCertum SmartSign, the application follows the attacker-controlled CPS URI, resulting in execution of the referenced local file or opening of the specified webpage. The issue is classified as CWE-73 due to external control over the resource path or target handled by the application.
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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 external control of file name or path vulnerability in Asseco proCertum SmartSign that allows execution of a local executable file or opening of an arbitrary URL via a crafted certificate CPS URI.
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.