GHSA-259v-xm34-p7fr: Typo3 Cross-Site Scripting in Language Pack Handling

medium Affects typo3/cms. Feed 2026.10.29.4, updated 2026-10-29; published 2024-06-05; advisory modified 2024-12-02.

Typo3 Cross-Site Scripting in Language Pack Handling

Package: typo3/cms Composer
Affected versions: >=9.0.0 and <9.5.4
Fixed in: 9.5.4
Severity: medium
Exploitation: not on CISA KEV
Published: 2024-06-05
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

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