phpwarden
FeaturesComparePricingAdvisoriesBlogDocsChangelogLog in
Log inStart free

CVE-2021-35210: Cross site scripting in the system log

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

Cross site scripting in the system log

Package
contao/contao Composer
Affected versions
>=4.5.0 and <4.9.16 or >=4.10.0 and <4.11.5 or >=4.10.0 and <4.11.0 or >=4.11.0 and <4.11.5
Fixed in
4.9.16, 4.11.5
Severity
medium  CVSS 6.1
Exploitation
not on CISA KEV · EPSS 1% (54.5th percentile)
Published
2021-07-01
Source
osv.dev

References

Cross site scripting in the system log

Package
contao/core-bundle Composer
Affected versions
>=4.5.0 and <4.9.16 or >=4.10.0 and <4.11.5 or >=4.10.0 and <4.11.0 or >=4.11.0 and <4.11.5
Fixed in
4.9.16, 4.11.5
Severity
medium  CVSS 6.1
Exploitation
not on CISA KEV · EPSS 1% (54.5th percentile)
Published
2021-07-01
Source
osv.dev

References

CWE-79
NVD recordcontao/contao advisoriescontao/core-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