CVE-2021-33339

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-08-04 · updated 2026-06-17
Weakness: CWE-79

Description

Cross-site scripting (XSS) vulnerability in the Fragment module in Liferay Portal 7.2.1 through 7.3.4, and Liferay DXP 7.2 before fix pack 9 allows remote attackers to inject arbitrary web script or HTML via the _com_liferay_site_admin_web_portlet_SiteAdminPortlet_name parameter.

Affected products

Liferay Digital Experience Platform: 7.2, 7.2-fix_pack_1, 7.2-fix_pack_2, 7.2-fix_pack_3, 7.2-fix_pack_4, 7.2-fix_pack_5 (+3)
Liferay Portal: from 7.2.1 before 7.3.5 — fixed in 7.3.5

How to fix

Upgrade to a fixed version: Liferay Portal 7.3.5. Check the vendor advisory for mitigations.

References

https://issues.liferay.com/browse/LPE-17102
https://portal.liferay.dev/learn/security/known-vulnerabilities/-/asset_publisher/HbL5mxmVrnXW/content/id/120747934
https://issues.liferay.com/browse/LPE-17102
https://portal.liferay.dev/learn/security/known-vulnerabilities/-/asset_publisher/HbL5mxmVrnXW/content/id/120747934

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