What’s Vulnerable › Vulnerabilities

CVE-2021-4072: Cross-site Scripting (XSS) - Stored in elgg/elgg

• 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: yes
• Published: 2021-12-24 · updated 2026-06-17
• Weakness: CWE-79

Description

elgg is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected products

• Elgg: before 3.3.24 — fixed in 3.3.24

How to fix

Upgrade to a fixed version: Elgg 3.3.24. Check the vendor advisory for mitigations.

References

• https://github.com/elgg/elgg/commit/c30b17bf75256ed3fcc84e2083147cc3951423d0
• https://huntr.dev/bounties/74034253-732a-4251-a0f9-eca5f576c955
• https://github.com/elgg/elgg/commit/c30b17bf75256ed3fcc84e2083147cc3951423d0
• https://huntr.dev/bounties/74034253-732a-4251-a0f9-eca5f576c955

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