A critical security vulnerability was discovered in **GoSign Desktop**, a widely used electronic signature solution by Tinexta InfoCert. The flaws include **disabled TLS certificate validation** and an **unverified update mechanism**, enabling attackers to intercept sensitive data (e.g., credentials, documents, authentication tokens) via man-in-the-middle (MitM) attacks or deliver malicious updates. Since GoSign Desktop is often deployed in **government agencies, enterprises, and legal workflows**—sometimes with **administrator-level privileges**—exploitation could lead to **document tampering, fraud, or legal liability**. The lack of public patches or remediation timelines from InfoCert exacerbates the risk, leaving organizations exposed unless they implement compensating controls (e.g., network isolation, migration to the SaaS version). The vulnerability undermines trust in digital signature workflows, particularly in sectors where **legally binding documents** are processed.
TINEXTA S.P.A. cybersecurity rating report: https://www.rankiteo.com/company/tinexta
"id": "TIN4992049111725",
"linkid": "tinexta",
"type": "Vulnerability",
"date": "11/2025",
"severity": "85",
"impact": "",
"explanation": "Attack with significant impact with customers data leaks:"{'affected_entities': [{'customers_affected': ['Public administrations',
'Businesses',
'Professionals using GoSign '
'Desktop'],
'industry': ['Cybersecurity',
'Digital Trust Services',
'eIDAS Qualified Trust Service Provider'],
'location': ['Italy (HQ)',
'European Union (operational scope)'],
'name': 'Tinexta InfoCert S.p.A.',
'type': ['Private Company',
'Digital Signature Provider']}],
'attack_vector': ['Network-based (MitM)', 'Unverified Software Updates'],
'customer_advisories': ['Urgent: Avoid using GoSign Desktop until patched',
'Verify all digitally signed documents created during '
'vulnerability window'],
'data_breach': {'data_encryption': ['TLS encryption bypassed due to '
'validation flaw'],
'data_exfiltration': ['Possible via MitM attacks'],
'file_types_exposed': ['Digital signature files',
'PDF/Document formats (assumed)'],
'personally_identifiable_information': ['Potential (if '
'documents contain '
'PII)'],
'sensitivity_of_data': ['High (legally binding digital '
'signatures)',
'Confidential business/government '
'documents'],
'type_of_data_compromised': ['Potential: Credentials',
'Authentication Tokens',
'Digitally Signed Documents']},
'description': 'A significant security vulnerability has been discovered in '
'GoSign Desktop, a widely used solution for qualified '
'electronic signatures developed by Tinexta InfoCert S.p.A. '
'The flaws concern improper TLS (Transport Layer Security) '
'certificate validation and an unverified update mechanism. '
'Together, these issues could allow attackers to intercept '
'data or deliver malicious updates.\n'
'\n'
'The TLS certificate validation flaw leaves sessions '
'vulnerable to man-in-the-middle (MitM) attacks, enabling '
'attackers to intercept or tamper with encrypted traffic, '
'including credentials, authentication tokens, or documents. '
'The lack of cryptographic verification in the update '
'mechanism allows arbitrary code execution via malicious '
'update packages.\n'
'\n'
"The risk is amplified due to GoSign Desktop's widespread use "
'in government agencies and enterprises, often with '
'administrator-level permissions. The SaaS/web version is '
'reportedly unaffected, but the Desktop version remains '
'vulnerable pending patches.',
'impact': {'brand_reputation_impact': ['High (trust in digital signature '
'provider eroded)',
'Potential loss of '
'government/enterprise contracts'],
'data_compromised': ['Credentials',
'Authentication Tokens',
'Digitally Signed Documents',
'Sensitive Business/Government Data'],
'identity_theft_risk': ['High (if credentials intercepted)'],
'legal_liabilities': ['Fraudulent transactions',
'Regulatory non-compliance for digital '
'signatures',
'Contract disputes'],
'operational_impact': ['Potential fraud via manipulated digital '
'signatures',
'Legal liability from compromised documents',
'Loss of trust in electronic signature '
'workflows'],
'systems_affected': ['GoSign Desktop (Windows/macOS/Linux - '
'assumed)']},
'initial_access_broker': {'backdoors_established': ['Potential via malicious '
'updates'],
'data_sold_on_dark_web': ['Possible if '
'credentials/documents '
'exfiltrated'],
'entry_point': ['Network interception (MitM)',
'Compromised update server'],
'high_value_targets': ['Digitally signed contracts',
'Government/legal documents',
'Financial approvals']},
'investigation_status': 'Ongoing (no public patch timeline from vendor)',
'lessons_learned': ['Critical importance of TLS certificate validation in '
'security-sensitive applications',
'Mandatory code signing for software updates, especially '
'in high-trust contexts',
'Need for transparent vulnerability disclosure and patch '
'timelines',
'Risks of desktop applications in regulated workflows '
'(vs. SaaS alternatives)'],
'post_incident_analysis': {'corrective_actions': ['Implement proper TLS '
'certificate validation '
'(RFC 5280 compliance)',
'Enforce code signing for '
'all update packages',
'Conduct third-party '
'security audit of GoSign '
'Desktop',
'Establish transparent '
'vulnerability management '
'process'],
'root_causes': ['Lack of TLS certificate '
'validation in network '
'communications',
'Absence of cryptographic '
'verification for software updates',
'Insufficient secure coding '
'practices for high-trust '
'application',
'Delayed public disclosure and '
'patching process']},
'recommendations': ['Immediate: Isolate GoSign Desktop from untrusted '
'networks',
'Short-term: Migrate to SaaS version (QC2-certified) '
'where possible',
'Long-term: Implement rigorous code signing and TLS '
'validation in development lifecycle',
'Policy: Require third-party audits for electronic '
'signature software',
'Architectural: Prefer zero-trust models for high-value '
'document workflows'],
'references': [{'source': 'Security Research Report (unspecified)'},
{'source': 'eIDAS Regulation (EU No 910/2014)',
'url': 'https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32014R0910'}],
'regulatory_compliance': {'regulations_violated': ['Potential: eIDAS '
'Regulation (EU No '
'910/2014)',
'Local data protection '
'laws (if PII exposed)']},
'response': {'containment_measures': ['Disconnect GoSign Desktop from '
'internet-facing services',
'Restrict network access of the '
'application',
'Monitor for unexpected update '
'activity'],
'enhanced_monitoring': ['Recommended for update activity'],
'network_segmentation': ['Recommended as mitigation'],
'remediation_measures': ['Transition to SaaS version (if '
'feasible)']},
'stakeholder_advisories': ['Recommended: Notify all GoSign Desktop users of '
'risks',
'Coordinate with legal teams on signature '
'validity'],
'title': 'Critical Vulnerabilities in GoSign Desktop Allow Man-in-the-Middle '
'Attacks and Arbitrary Code Execution',
'type': ['Vulnerability',
'Man-in-the-Middle (MitM) Attack Risk',
'Arbitrary Code Execution Risk'],
'vulnerability_exploited': ['Improper TLS Certificate Validation (CWE-295)',
'Unverified Update Mechanism (Lack of Code '
'Signing)']}