CVE-2018-18689: Avanquest Expert PDF Ultimate

Medium severity, CVSS 5.3. EPSS: 3.6% chance of exploitation in the next 30 days.

The Portable Document Format (PDF) specification does not provide any information regarding the concrete procedure of how to validate signatures. Consequently, a Signature Wrapping vulnerability exists in multiple products. An attacker can use /ByteRange and xref manipulations that are not detected by the signature-validation logic. This affects Foxit Reader before 9.4 and PhantomPDF before 8.3.9 and 9.x before 9.4. It also affects eXpert PDF 12 Ultimate, Expert PDF Reader, Nitro Pro, Nitro Reader, PDF Architect 6, PDF Editor 6 Pro, PDF Experte 9 Ultimate, PDFelement6 Pro, PDF Studio Viewer 2018, PDF Studio Pro, PDF-XChange Editor and Viewer, Perfect PDF 10 Premium, Perfect PDF Reader, Soda PDF, and Soda PDF Desktop.

Affected products

  • Avanquest Expert PDF Ultimate: version 12.0.20 only
  • Avanquest PDF Experte Ultimate: version 9.0.270 only
  • Foxitsoftware Foxit Reader: version 9.1.0 only; version 9.2.0.9297 only; version 9.3.0.10826 only; version 9.2.0 only
  • Gonitro Nitro Pro: version 11.0.3.173 only
  • Gonitro Nitro Reader: version 5.5.9.2 only
  • Iskysoft PDF Editor 6: version 6.4.2.3521 only; version 6.6.2.3315 only; version 6.7.6.3399 only
  • Iskysoft PDFELEMENT6: version 6.8.0.3523 only; version 6.8.4.3921 only; version 6.7.1.3355 only; version 6.7.6.3399 only
  • PDF-Xchange PDF-Xchange Editor: version 7.0.237.1 only; version 7.0.326 only
  • Pdfforge PDF Architect: version 6.0.37 only; version 6.1.24.1862 only
  • Qoppa PDF Studio: version 12.0.7 only
  • Qoppa PDF Studio Viewer 2018: version 2018.0.1 only; version 2018.2.0 only
  • Sodapdf Soda PDF: version 9.3.17 only
  • Sodapdf Soda PDF Desktop: version 10.2.09 only; version 10.2.16.1217 only
  • Soft-Xpansion Perfect PDF 10: version 10.0.0.1 only
  • Soft-Xpansion Perfect PDF Reader: version 13.0.3 only; version 13.1.5 only
  • Tracker-Software PDF-Xchange Viewer: version 2.5 only
  • Visagesoft Expert PDF Reader: version 9.0.180 only

Published 2021-01-07. Last modified 2026-06-17.