What is CVE-2026-21311?

CVE-2026-21311 is a high-severity vulnerability in Adobe Commerce, classified under Cross-site Scripting. CVSS score: 8.0/10. Published 2026-03-11.

How severe is CVE-2026-21311?

High severity. CVSS v3 base score is 8.0 out of 10.

XSS in Adobe Commerce

CVE-2026-21311

Adobe Commerce versions 2.4.9-alpha3, 2.4.8-p3, 2.4.7-p8, 2.4.6-p13, 2.4.5-p15, 2.4.4-p16 and earlier are affected by a stored Cross-Site Scripting (XSS) vulnerability that could be abused by a high-privileged attacker to inject malicious…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.001 (33.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N.

Affected products

Adobe Commerce — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

helpx.adobe.com/security/products/magento/apsb26-05.html (vendor-advisory)

Frequently asked questions

What is CVE-2026-21311?: CVE-2026-21311 is a high-severity vulnerability in Adobe Commerce, classified under Cross-site Scripting. CVSS score: 8.0/10. Published 2026-03-11.
How severe is CVE-2026-21311?: High severity. CVSS v3 base score is 8.0 out of 10.