Cyber Resilience

CVE-2026-34686

High

Published: 12 May 2026

Published
12 May 2026
Modified
13 May 2026
KEV Added
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Patch
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CVSS Score v3.1 8.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
EPSS Score 0.0040 32.1th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-34686 is a high-severity Cross-site Scripting (CWE-79) vulnerability in Adobe Commerce. Its CVSS base score is 8.7 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique JavaScript (T1059.007); ranked at the 32.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability details

Adobe Commerce versions 2.4.9-beta1, 2.4.8-p4, 2.4.7-p9, 2.4.6-p14, 2.4.5-p16, 2.4.4-p17 and earlier are affected by a stored Cross-Site Scripting (XSS) vulnerability that could be abused by a low-privileged attacker to inject malicious scripts into vulnerable form fields. Malicious JavaScript may be…

more

executed in a victim's browser when they browse to the page containing the vulnerable field, potentially gaining elevated access or control over the victim's account or session. Scope is changed.

CWE(s)
CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1059.007 JavaScript Execution
Adversaries may abuse various implementations of JavaScript for execution.
attack.mitre.org →
T1185 Browser Session Hijacking Collection
Adversaries may take advantage of security vulnerabilities and inherent functionality in browser software to change content, modify user-behaviors, and intercept information as part of various browser session hijacking techniques.
attack.mitre.org →
T1539 Steal Web Session Cookie Credential Access
An adversary may steal web application or service session cookies and use them to gain access to web applications or Internet services as an authenticated user without needing credentials.
attack.mitre.org →
Why these techniques?

Stored XSS directly enables browser-side JS execution (T1059.007) and session hijacking/cookie theft (T1185/T1539) leading to account takeover.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2025-24410Same product: Adobe Commerce
CVE-2026-21361Same product: Adobe Commerce
CVE-2025-24416Same product: Adobe Commerce
CVE-2026-21290Same product: Adobe Commerce
CVE-2025-24412Same product: Adobe Commerce
CVE-2025-24414Same product: Adobe Commerce
CVE-2025-24413Same product: Adobe Commerce
CVE-2026-21311Same product: Adobe Commerce
CVE-2025-24417Same product: Adobe Commerce
CVE-2026-21284Same product: Adobe Commerce

Affected Assets

adobe
commerce
2.4.4, 2.4.5, 2.4.6, 2.4.7, 2.4.8
adobe
commerce b2b
1.3.3, 1.3.4, 1.4.2, 1.5.2, 1.5.3
adobe
magento
2.4.6, 2.4.7, 2.4.8, 2.4.9

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

CA-8 Penetration Testing
addresses: CWE-79

Penetration testing submits XSS payloads to web applications, detecting cross-site scripting flaws for subsequent remediation.

SI-10 Information Input Validation
addresses: CWE-79

Validates web inputs to reject script-related content that could produce XSS.

SI-15 Information Output Filtering
addresses: CWE-79

Output validation against expected content can reject or sanitize script content in generated web pages, reducing XSS exploitability.

References