Threats / Adobe / CVE-2026-34621
CVE-2026-34621
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Adobe Acrobat and Reader vulnerability
Adobe Acrobat and Reader contain a prototype pollution vulnerability enabling arbitrary code execution. The flaw is tracked as CWE-1321 and has been exploited in the wild.
Verdict
Today item — known-exploited.
Prototype pollution in Adobe's document readers allows attackers to achieve code execution through malicious PDF or document content. Active exploitation in the wild elevates risk for users opening untrusted documents.
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Public proof-of-concept exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
5 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-04-13).
Probability (EPSS)
EPSS 0.07086 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Adobe, Acrobat and Reader. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-1321 Prototype Pollution — weakness family: Injection.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious PDF that exploits prototype pollution in the JavaScript engine to pollute object prototypes.
Business
Users face direct compromise of their systems when opening seemingly legitimate PDF documents.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I escalate the prototype pollution to achieve arbitrary code execution within the Acrobat/Reader process context.
Business
Attackers gain the ability to execute commands with the privileges of the user running the application, risking data theft and system compromise.
3
Lateral reach — past segmentation narrative 3
Attacker
I distribute the malicious PDF through email, file sharing, or compromised websites to maximize victim reach.
Business
Organizations experience widespread endpoint compromise and potential lateral movement into corporate networks.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05