CVE-2021-3313

Plone CMS until version 5.2.4 has a stored Cross-Site Scripting (XSS) vulnerability in the user fullname property and the file upload functionality. The user's input data is not properly encoded when being echoed back to the user. This data can be interpreted as executable code by the browser and allows an attacker to execute JavaScript in the context of the victim's browser if the victim opens a vulnerable page containing an XSS payload.

• CWE-79

• http://www.openwall.com/lists/oss-security/2021/05/22/1Mailing List, Third Party Advisory
• https://plone.org/download/releases/5.2.3Release Notes, Vendor Advisory
• https://plone.org/security/hotfix/20210518Vendor Advisory
• https://www.compass-security.com/fileadmin/Research/Advisories/2021-07_CSNC-2021-013_XSS_in_Plone_CMS.txtExploit, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2021/05/22/1Mailing List, Third Party Advisory
• https://plone.org/download/releases/5.2.3Release Notes, Vendor Advisory
• https://plone.org/security/hotfix/20210518Vendor Advisory
• https://www.compass-security.com/fileadmin/Research/Advisories/2021-07_CSNC-2021-013_XSS_in_Plone_CMS.txtExploit, Third Party Advisory

Published

May 20, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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