Stored cross-site scripting in Adobe products - CVE-2026-21291

Vulnerability identifier: #VU123791

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]

CVE-ID: CVE-2026-21291

CWE-ID: CWE-79

Exploitation vector: Remote access

Exploit availability: No public exploit available

The disclosed vulnerability allows a remote user to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. A remote user can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Adobe Commerce B2B
Magento Open Source
Adobe Commerce (formerly Magento Commerce)

Install updates from vendor's website.

Adobe Commerce B2B - addressed in versions 1.3.3‑p17, 1.3.4-p16, 1.3.5‑p14, 1.4.2‑p9, 1.5.2-p4, 1.5.3 beta1
Magento Open Source - addressed in versions 2.4.5‑p16, 2.4.6-p14, 2.4.7-p9, 2.4.8-p4, 2.4.9‑beta1
Adobe Commerce (formerly Magento Commerce) - addressed in versions 2.4.4‑p17, 2.4.5‑p16, 2.4.6‑p14, 2.4.7‑p9, 2.4.8‑p4, 2.4.9‑beta1

• https://helpx.adobe.com/security/products/magento/apsb26-05.html

• Multiple vulnerabilities in Adobe Commerce and Magento Open Source