CVE-2026-26928
Received Received - Intake
Unverified DLL Upload in SzafirHost Enables Remote Code Execution

Publication date: 2026-04-02

Last updated on: 2026-04-02

Assigner: CERT.PL

Description
SzafirHost downloads necessary files in the context of the initiating web page. When called, SzafirHost updates its dynamic library. JAR files are correctly verified based on a list of trusted file hashes, and if a file was not on that list, it was checked to see if it had been digitally signed by the vendor. The application doesn't verify hash or vendor's digital signature of uploaded DLL, SO, JNILIB or DYLIB file. The attacker can provide malicious file which will be saved in users /temp folder and executed by the application. This issue was fixed in version 1.1.0.
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Meta Information
Published
2026-04-02
Last Modified
2026-04-02
Generated
2026-06-16
AI Q&A
2026-04-02
EPSS Evaluated
2026-06-15
NVD
CVE-2026-26928
EUVD
EUVD-2026-18229
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
krajowa_izba_rozliczeniowa szafirhost 1.1.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-354 The product does not validate or incorrectly validates the integrity check values or "checksums" of a message. This may prevent it from detecting if the data has been modified or corrupted in transmission.
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Compliance Impact

The provided information does not specify how the vulnerability in SzafirHost affects compliance with common standards and regulations such as GDPR or HIPAA.

Executive Summary

The vulnerability in SzafirHost involves improper verification of certain dynamic library files. While JAR files are correctly verified using trusted hashes and digital signatures, DLL, SO, JNILIB, and DYLIB files are not checked for hash or vendor digital signatures. This allows an attacker to provide a malicious file that gets saved in the user's /temp folder and executed by the application.

Impact Analysis

This vulnerability can lead to the execution of malicious code on the affected system because an attacker can supply harmful dynamic library files that the application will run without proper verification. This can compromise the security and integrity of the user's environment.

Detection Guidance

This vulnerability involves the SzafirHost application saving and executing malicious DLL, SO, JNILIB, or DYLIB files in the user's /temp folder without verifying their hash or digital signature.

To detect this vulnerability on your system, you can monitor the /temp directory for suspicious DLL, SO, JNILIB, or DYLIB files that were recently created or modified.

Additionally, you can check the version of SzafirHost installed to see if it is below 1.1.0, as the issue was fixed starting from version 1.1.0.

  • Use commands like `ls -ltr /temp/*.dll /temp/*.so /temp/*.jnilib /temp/*.dylib` on Unix-like systems to list recently modified or created files.
  • Check the SzafirHost version by running the application with a version flag or checking its installation metadata.
  • Monitor process execution logs or use system auditing tools to detect execution of files from the /temp directory.
Mitigation Strategies

The primary mitigation step is to upgrade SzafirHost to version 1.1.0 or later, where this vulnerability has been fixed.

Until the upgrade is applied, restrict or monitor the execution of DLL, SO, JNILIB, or DYLIB files from the /temp directory to prevent malicious files from being executed.

Implement file integrity monitoring and restrict write permissions to the /temp folder to limit the ability of attackers to place malicious files there.

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