Known exploited vulnerability
CVE-2026-34621
The short answer
CVE-2026-34621 affects Adobe Acrobat DC and is rated high (CVSS 8.6). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-04-13: attackers are using it, so patch it first.
What it is
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.
Weakness: CWE-1321.
Severity
8.6 high
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Apr 13, 2026
Federal due date Apr 27, 2026
EPSS, next 30 days
7.3%
Higher than 94% of scored CVEs
How it can be exploited
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
Acrobat DC, Acrobat Reader DC, Acrobat 2024. NVD's record lists the exact affected versions.
References
- helpx.adobe.com/security/products/acrobat/apsb26-43.html Vendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34621 US Government Resource
Questions
Is CVE-2026-34621 being exploited?
Yes. CISA added CVE-2026-34621 to its Known Exploited Vulnerabilities catalog on 2026-04-13, with a federal remediation due date of 2026-04-27.
How do I fix CVE-2026-34621?
CISA's 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.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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