CVE-2026-57916: CWE-73 External Control of File Name or Path in Asseco proCertum SmartSign
proCertum SmartSign opens Certificate Practice Statement (CPS) URI without schema validation. An attacker can prepare arbitrary certificate with CPS URI pointing to a local executable file or any URL, sign a document with it, and send it to the victim. When the victim opens the document in the application, the specified file will be executed (or webpage will be opened). This issue was fixed in version 9.4.3.90.
AI Analysis
Technical Summary
The vulnerability identified as CVE-2026-57916 in Asseco proCertum SmartSign involves improper validation of CPS URIs. The application opens CPS URIs without schema validation, allowing an attacker to embed a CPS URI that points to a local executable file or arbitrary URL. When a victim opens a signed document containing such a certificate, the application may execute the local file or open the URL, leading to potential unauthorized code execution or unwanted web navigation. The vulnerability is categorized under CWE-73 (External Control of File Name or Path). The issue was addressed in version 9.4.3.90 of the product.
Potential Impact
An attacker can cause the application to execute arbitrary local files or open arbitrary web pages when a victim opens a maliciously crafted signed document. This can lead to unauthorized code execution or phishing attacks. The CVSS 4.0 base score is 4.6 (medium severity), reflecting local attack vector with user interaction required and low complexity.
Mitigation Recommendations
This vulnerability was fixed in proCertum SmartSign version 9.4.3.90. Users should upgrade to version 9.4.3.90 or later to remediate the issue. No other official remediation or temporary fixes are indicated. Patch status is confirmed by the vendor advisory stating the fix in 9.4.3.90.
CVE-2026-57916: CWE-73 External Control of File Name or Path in Asseco proCertum SmartSign
Description
proCertum SmartSign opens Certificate Practice Statement (CPS) URI without schema validation. An attacker can prepare arbitrary certificate with CPS URI pointing to a local executable file or any URL, sign a document with it, and send it to the victim. When the victim opens the document in the application, the specified file will be executed (or webpage will be opened). This issue was fixed in version 9.4.3.90.
CVSS v4.0
Score 4.6medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability identified as CVE-2026-57916 in Asseco proCertum SmartSign involves improper validation of CPS URIs. The application opens CPS URIs without schema validation, allowing an attacker to embed a CPS URI that points to a local executable file or arbitrary URL. When a victim opens a signed document containing such a certificate, the application may execute the local file or open the URL, leading to potential unauthorized code execution or unwanted web navigation. The vulnerability is categorized under CWE-73 (External Control of File Name or Path). The issue was addressed in version 9.4.3.90 of the product.
Potential Impact
An attacker can cause the application to execute arbitrary local files or open arbitrary web pages when a victim opens a maliciously crafted signed document. This can lead to unauthorized code execution or phishing attacks. The CVSS 4.0 base score is 4.6 (medium severity), reflecting local attack vector with user interaction required and low complexity.
Mitigation Recommendations
This vulnerability was fixed in proCertum SmartSign version 9.4.3.90. Users should upgrade to version 9.4.3.90 or later to remediate the issue. No other official remediation or temporary fixes are indicated. Patch status is confirmed by the vendor advisory stating the fix in 9.4.3.90.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- CERT-PL
- Date Reserved
- 2026-06-26T10:47:10.593Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a673f8f9c2644c7f8f0f16b
Added to database: 07/27/2026, 11:22:55 UTC
Last enriched: 07/30/2026, 01:21:43 UTC
Last updated: 09/10/2026, 16:41:09 UTC
Views: 60
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