CVE-2026-107845: Contao: Cross-site scripting in the comments bundle

critical Affects contao/comments-bundle. Feed 2026.10.29.3, updated 2026-10-29; published .

Contao: Cross-site scripting in the comments bundle

Package
contao/comments-bundle Composer
Affected versions
>=4.0.0 and <5.3.50 or >=5.4.0-RC1 and <5.7.12
Fixed in
5.3.50, 5.7.12
Severity
critical  CVSS 9.3
Exploitation
not on CISA KEV · EPSS 0% (20.1th percentile)
Published
2026-10-09
Source
osv.dev

References

CWE-116CWE-79
NVD recordcontao/comments-bundle 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

Install docs   How findings are ranked

Related advisories