CVE-2021-3980: Information exposure in elgg

high Affects elgg/elgg. Feed 2026.10.29.2, updated 2026-10-29; published 2021-12-16; advisory modified 2023-11-08.

Information exposure in elgg

Package: elgg/elgg Composer
Affected versions: <3.3.23 or >=4.0.0 and <4.0.5
Fixed in: 3.3.23, 4.0.5
Severity: high CVSS 7.5
Exploitation: not on CISA KEV · EPSS 2% (75.7th percentile)
Published: 2021-12-16
Source: osv.dev

References

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden deps composer.lock

# or, without Composer
pipx install phpwarden   &&   phpwarden deps composer.lock

Or keep it checked automatically: GitHub Action · pre-commit hook · GitLab CI · Laravel artisan command

Install docs How findings are ranked

Related advisories

CVE-2019-11016 medium Elgg open redirect same package: elgg/elgg
CVE-2011-2935 medium Elgg Reflected XSS Vulnerability same package: elgg/elgg
CVE-2021-3964 medium elgg is vulnerable to Authorization Bypass Through User-Controlled Key same package: elgg/elgg
CVE-2021-4072 medium elgg is vulnerable to Cross-site Scripting same package: elgg/elgg
CVE-2022-0482 critical Exposure of Private Personal Information to an Unauthorized Actor in alextselegidis/easyap same weakness: CWE-359
CVE-2024-11396 medium The Event Monster – Event Management, Tickets Booking, Upcoming Event plugin for WordPress same weakness: CWE-359