CVE-2026-34621 (GCVE-0-2026-34621)

Vulnerability from cvelistv5 – Published: 2026-04-11 06:45 – Updated: 2026-04-14 03:55
VLAI? CISA KEV
Title
Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)
Summary
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.
Severity ?
8.6 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)
Assigner
References
Impacted products
Vendor Product Version
Adobe Acrobat Reader Affected: 0 , ≤ 26.001.21367 (semver)
Create a notification for this product.
Date Public ?
2026-04-10 17:00
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 3f9a262f-6bab-4d23-a632-e2ff6d961496

Vulnerability ID: CVE-2026-34621

Status: Confirmed

Status Updated: 2026-04-13 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-04-13
Asserted: 2026-04-13
Scope
Notes: KEV entry: Adobe Acrobat and Reader Prototype Pollution Vulnerability | Affected: Adobe / Acrobat and Reader | Description: Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution. | 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. | Due date: 2026-04-27 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://helpx.adobe.com/security/products/acrobat/apsb26-43.html ; https://nvd.nist.gov/vuln/detail/CVE-2026-34621
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-1321
Feed CISA Known Exploited Vulnerabilities Catalog
Product Acrobat and Reader
Due Date 2026-04-27
Date Added 2026-04-13
Vendorproject Adobe
Vulnerabilityname Adobe Acrobat and Reader Prototype Pollution Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-04-13 18:00 UTC | Updated: 2026-04-13 18:00 UTC
Show details on NVD website
To clipboard 

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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.