Adobe Patches Acrobat Reader Zero-Day Vulnerability Exploited in the Wild
ID: 4cc818f9-cd87-5d8e-a0a8-9314d35e00b7
STIX ID: report--4cc818f9-cd87-5d8e-a0a8-9314d35e00b7
Feed Name: Cyber Press
Threat Score
Adobe released an urgent security bulletin (APSB26-43) on 2026-04-11 to address a critical zero-day (CVE-2026-34621) in Acrobat and Acrobat Reader for Windows and macOS that enables arbitrary code execution via malicious PDF documents; the flaw is a Prototype Pollution issue (CWE-1321) with a CVSS 3.1 base score of 8.6 and is reported to be actively exploited in the wild — users and administrators are urged to upgrade immediately to the patched versions listed in the bulletin.
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