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Fencer Vulns
medium 6.9

CVE-2021-28556 json

Magento Commerce DOM-based cross-site scripting (XSS) could lead to arbitrary javascript execution

published 2021-06-28 5 y ago modified 2026-09-08 2 mo ago also BIT-magento-2021-28556 , EUVD-2022-2149 , GHSA-39ch-rg26-gmq5

cvss
6.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

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.

Patch / fix

  • packagist magento/community-edition 2.3.7, 2.4.2-p1
  • bitnami magento 2.3.7, 2.4.3
  • magento magento 2.3.7

Exploit prediction

1.40% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N
GitHub 3.1 6.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N
NVD 3.1 4.8 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 3.5 AV:N/AC:M/Au:S/C:N/I:P/A:N
OSV 3.1 4.8 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
packagist magento/community-edition
>=2.4.0, <2.4.2-p1
<2.3.7
2.4.2-p1
2.3.7
packagist magento/project-community-edition
<=2.0.2
 no fix listed
bitnami magento
<2.3.7
>=2.4.0, <2.4.3
2.3.7
2.4.3

Affected products

  • Adobe Magento Commerce

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.