Cyber Resilience

CVE-2026-34621

Adobe Acrobat 24.0.0 – 24.001.30362

CISA KEVActive ExploitationEUVD Exploited
Published
11 April 2026
Modified
13 April 2026
KEV Added
13 April 2026
Patch / advisory
View advisory
CVSS Score v3.1 8.6
Click a component to see what it means
Raw vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
EPSS Score 0.071 94th percentile
Risk Priority 87 floored blend · peak EPSS

Summary

CVE-2026-34621 is a high-severity Prototype Pollution (CWE-1321) vulnerability in Apple Macos. Its CVSS base score is 8.6 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 6% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

Acrobat Reader versions 24.001.30356, 26.001.21367 and earlier contain an Improperly Controlled Modification of Object Prototype Attributes vulnerability, also known as Prototype Pollution and tracked as CWE-1321. The flaw can lead to arbitrary code execution in the context of the current user and carries a CVSS 3.1 score of 8.6 reflecting local attack vector, low attack complexity, no required privileges, required user interaction, and changed scope with high impact on confidentiality, integrity, and availability.

An attacker can exploit the issue by supplying a malicious file that the victim must open; successful exploitation grants code execution privileges equivalent to those of the targeted user without needing additional authentication or elevated rights.

Adobe has published mitigation guidance in security advisory APSB26-43, and the vulnerability appears in CISA's Known Exploited Vulnerabilities catalog. The associated EPSS score has remained in a narrow band between 0.1103 and 0.1216 with no material upward trajectory after disclosure.

EU & UK References

Vulnerability Data

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…

more

user interaction in that a victim must open a malicious file.

CWE(s)
CWE-1321
KEV Date Added
13 April 2026

Related Threats

MITRE ATT&CK Enterprise Techniques

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059 Command and Scripting Interpreter Execution
Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1565 Data Manipulation Impact
Adversaries may insert, delete, or manipulate data in order to influence external outcomes or hide activity, thus threatening the integrity of the data.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-34626Same product: Adobe Acrobat
CVE-2026-34622Same product: Adobe Acrobat
CVE-2021-28550Same product: Adobe Acrobatboth on KEV
CVE-2023-21608Same product: Adobe Acrobatboth on KEV
CVE-2023-26369Same product: Adobe Acrobatboth on KEV
CVE-2021-21017Same product: Adobe Acrobatboth on KEV
CVE-2020-9715Same product: Adobe Acrobat Dcboth on KEV
CVE-2018-4990Same product: Adobe Acrobat Dcboth on KEV
CVE-2010-2883Same product: Adobe Acrobatboth on KEV
CVE-2023-21579Same product: Adobe Acrobat

Affected Assets

adobe
acrobat dc
≤ 26.001.21411
adobe
acrobat reader dc
≤ 26.001.21411
adobe
acrobat
24.0.0 — 24.001.30362 · 24.0.0 — 24.001.30360

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V15.3.6

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require input validation and safe property assignment to prevent prototype pollution.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development catches prototype-pollution flaws before release.

A.8.25 Secure development life cycle partial match
prevents

Secure development lifecycle mandates input validation and object-handling controls that directly prevent prototype pollution.

A.8.26 Application security requirements partial match
prevents

Application security requirements explicitly call for safeguards against unsafe object attribute manipulation.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles reduce the likelihood of prototype pollution through safe design patterns.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly prohibit unsafe prototype attribute assignment and require defensive checks.

A.8.32 Change management partial match
prevents

Change-management processes ensure security fixes for prototype-pollution issues are tracked and deployed.

References