What is CVE-2021-28556?

CVE-2021-28556 is a medium-severity vulnerability in Adobe Magento Commerce, classified under Cross-site Scripting. CVSS score: 6.9/10. Published 2021-06-28.

How severe is CVE-2021-28556?

Medium severity. CVSS v3 base score is 6.9 out of 10.

XSS in Adobe Magento Commerce

CVE-2021-28556

Magento versions 2.4.2 (and earlier), 2.4.1-p1 (and earlier) and 2.3.6-p1 (and earlier) are affected by a DOM-based Cross-Site Scripting vulnerability on mage-messages cookies. Successful exploitation could lead to arbitrary JavaScript execution by an unauthenticated attacker. User interaction is required for successful exploitation.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-06-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.014 (71.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Adobe Magento Commerce — versions unspecified
Magento

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

helpx.adobe.com/security/products/magento/apsb21-30.html (Vendor Advisory)

Frequently asked questions

What is CVE-2021-28556?: CVE-2021-28556 is a medium-severity vulnerability in Adobe Magento Commerce, classified under Cross-site Scripting. CVSS score: 6.9/10. Published 2021-06-28.
How severe is CVE-2021-28556?: Medium severity. CVSS v3 base score is 6.9 out of 10.