In CISA KEV8.6 HighCWE-1321
CVE-2026-34621
Adobe Acrobat and Reader Prototype Pollution Vulnerability
AdobeAcrobat and Reader
Status
- Exploited in the wild
- In CISA KEV since 13 Apr
- Vendor fix available
Federal deadlineMon 27 Apr, 23:59 UTC
Passed 180 days ago
CISA KEV · added 13 Apr
Exploit probabilityEPSSchecked 25 Oct
2.2%probability of exploitation in the next 30 days
Higher than 82% of scored CVEs
SeverityCVSS
8.6High
Description NVD
Acrobat Reader versions 24.001.30356, 26.001.21367 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Coverage 13 articles · 8 outlets
See the full timelineShow as table
- Exploiters target SAP SQLi and Adobe zero day flaws in AprilThe Hacker News · mentions it in passing
- Microsoft fixes 167 flaws, patches SharePoint zero day exploitKrebs on Security · mentions it in passing
- Adobe Patches 55 Vulnerabilities Across 11 ProductsSecurityWeek · mentions it in passing
- CISA Adds Critical Adobe, Microsoft, Fortinet Flaws to KEV CatalogSecurity Affairs
- Adobe Acrobat Bug CVE-2026-34621 Allows Arbitrary Code ExecutionCISA · official notice
- CISA warns of active Adobe Acrobat flaw letting hackers run codeCISA · official notice
- Adobe patches CVE-2026-34621 in Acrobat after wild exploitationDark Reading
- Alleged Police Tipline Data Sale, iOS and Adobe Exploits, RDWeb Access Listings, and Gunra RecruitmentSOCRadar
- Adobe Reader zero day exploited via malicious PDF to steal filesMalwarebytes
- Adobe patches Acrobat after CVE‑2026‑34621 exploited in the wildSOCRadar
- Patch Issued for Critical Adobe Acrobat Zero Day CVE-2026-34621Security Affairs
- Adobe Patches Reader Zero-Day Exploited for MonthsSecurityWeek
- Adobe patches zero day flaw in Acrobat Reader, CVE-2026-34621The Hacker News · first in our coverage