CVE-2021-31274: Cross-site Scripting in LibreNMS

medium Affects librenms/librenms. Feed 2026.10.29.4, updated 2026-10-29; published ; advisory modified .

Cross-site Scripting in LibreNMS

Package
librenms/librenms Composer
Affected versions
<21.3.0
Fixed in
21.3.0
Severity
medium  CVSS 5.4
Exploitation
not on CISA KEV · EPSS 1% (55.8th percentile)
Published
2021-09-09
Source
osv.dev

References

CWE-79
NVD recordlibrenms/librenms advisories

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

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