What’s Vulnerable › Vulnerabilities

CVE-2021-3964: Authorization Bypass Through User-Controlled Key in elgg/elgg

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-12-01 · updated 2026-06-17
• Weakness: CWE-639

Description

elgg is vulnerable to Authorization Bypass Through User-Controlled Key

Affected products

• Elgg: before 3.3.22 — fixed in 3.3.22

How to fix

Upgrade to a fixed version: Elgg 3.3.22. Check the vendor advisory for mitigations.

References

• https://github.com/elgg/elgg/commit/d9fcad76ee380ea17edd61d13d0f87828ea3f744
• https://huntr.dev/bounties/a4df45d6-b739-4299-967f-c960b569383a
• https://github.com/elgg/elgg/commit/d9fcad76ee380ea17edd61d13d0f87828ea3f744
• https://huntr.dev/bounties/a4df45d6-b739-4299-967f-c960b569383a

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