Critical Security Flaw in LibreOffice Exposes PDF Documents to Forgery Attacks
A high-severity vulnerability (CVE-2025-2866) has been discovered in LibreOffice, allowing attackers to forge PDF signatures using the adbe.pkcs7.sha1 SubFilter.
This flaw affects multiple Linux distributions, including Mageia, and poses significant risks for businesses and individuals relying on digitally signed documents for authentication.
Understanding the LibreOffice PDF Signature Forgery Exploit
The vulnerability enables malicious actors to:
✔ Manipulate signed PDFs without detection
✔ Bypass integrity checks in digital workflows
✔ Compromise legal, financial, and enterprise documents
Affected Systems:
Mageia Linux (MGASA-2025-0154)
Potentially other Linux distributions (Debian Security Advisory DSA-2025-070)
LibreOffice versions prior to 24.2.7.2
How Does This Vulnerability Impact Businesses?
Organizations handling contracts, invoices, or compliance documents are at high risk. A forged signature could lead to:
Financial fraud (tampered transactions)
Legal disputes (disputed agreements)
Regulatory penalties (non-compliant records)
Mitigation & Patch Information
Mageia has released an urgent update (libreoffice-24.2.7.2-1.3.mga9) to address this issue.
Recommended Actions:
✅ Update LibreOffice immediately via your package manager
✅ Verify PDF signatures using alternative tools
✅ Audit sensitive documents for potential tampering
Why This Vulnerability Matters for Cybersecurity Professionals
This exploit highlights critical weaknesses in open-source document security, emphasizing the need for:
Stronger cryptographic validation in PDF software
Enterprise-grade document integrity solutions
Continuous vulnerability monitoring
Additional Resources & References
🔗 Mageia Bug Report #34234
🔗 LibreOffice Security Advisory
🔗 CVE-2025-2866 Details (MITRE)
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