Risk Letters

Exploited vulnerability

CVE-2026-34621

TLP:CLEAR

Adobe Acrobat and Reader Prototype Pollution Vulnerability

Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution.

Facts

  • Vendor: Adobe
  • Product: Acrobat and Reader
  • CVSS: 9.6
  • EPSS (probability of exploitation within 30 days): 7.2 %
  • On CISA's Known Exploited Vulnerabilities list since: 13 April 2026
  • First known exploitation: 13 April 2026
  • CISA's deadline for US federal agencies: 27 April 2026
  • Weakness: CWE-1321
  • First seen by Risk Letters: 11 April 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD