What’s Vulnerable › Vulnerabilities

CVE-2021-33512

• Severity: medium (CVSS 5.4 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: 2021-05-21 · updated 2026-06-17
• Weakness: CWE-79

Description

Plone through 5.2.4 allows stored XSS attacks (by a Contributor) by uploading an SVG or HTML document.

Affected products

• Plone CMS: through 5.2.4

References

• http://www.openwall.com/lists/oss-security/2021/05/22/1
• https://plone.org/security/hotfix/20210518/stored-xss-from-file-upload-svg-html
• http://www.openwall.com/lists/oss-security/2021/05/22/1
• https://plone.org/security/hotfix/20210518/stored-xss-from-file-upload-svg-html

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