Skip to main content
Apexward Pulse

Adobe

Adobe Acrobat and Reader Prototype Pollution Vulnerability

CVE-2026-34621

What this means

This is rated high severity (8.6 out of 10). It is on the known-exploited catalogue, which means attacks using it have already been seen. Ask IT whether Adobe Acrobat Dc, Adobe Acrobat Reader Dc and Apple Macos, and 2 more are in your estate, and treat that as the priority.

Full vendor description

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.

Scoring and exploitation

8.6/ 10
CVSS 3.1 base scoreHigh

Exploitable only with local access without any account, but only if a user takes an action, such as opening a file or link. High impact on confidentiality, integrity and availability, and it can reach beyond the vulnerable system.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Exploitability

Longer bar: easier to attack

Attack vectorLocalAV:L
Attack complexityLowAC:L
Privileges requiredNonePR:N
User interactionRequiredUI:R
ScopeChangedS:C

Impact

Longer bar: more harm

ConfidentialityHighC:H
IntegrityHighI:H
AvailabilityHighA:H
~7.2% estimated chance of attack in 30 daysModel estimate (): a probability signal, not confirmed exploitation
Exploited in the wild
Yes — confirmed exploitation (US CISA )
Not reported
Listed product
Adobe Acrobat and Reader

Weaknesses

CWE-1321

Affected products ()

  • Adobe Acrobat Dc
  • Adobe Acrobat Reader Dc
  • Apple Macos
  • Microsoft Windows
  • Adobe Acrobat
Show the raw CPE strings (5)
  • cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:*
  • cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:*
  • cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*
  • cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*
  • cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:*

References

2 links from the CVE record, grouped by site; the vendor's advisory comes first.

Related feed events

  • Adobe Acrobat and Reader Prototype Pollution Vulnerability

    Type Vulnerability

    Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution. Known-exploited catalogue reports exploitation in the wild.

    Next step: Confirm whether Adobe Acrobat and Reader is in your estate.

    Who's reporting

    1 of 3 perspectives

    Official authority: Official 1Vendor statement missing. no VendorResearcher coverage missing. no Researcher1 signal

    Only official coverage so far. Treat as an early signal.

    Adobe Acrobat and Reader
    CVE-2026-34621