CVE-2023-39062 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in spipu/html2pdf. 2 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for spipu/html2pdf — see the affected versions and patch details below.
Spipu HTML2PDF vulnerable to cross-site scripting
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
Exploitation and automatability from CISA’s SSVC triage for CVE-2023-39062.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
spipu/html2pdfReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
Cross Site Scripting vulnerability in Spipu HTML2PDF before v.5.2.8 allows a remote attacker to execute arbitrary code via a crafted script to the forms.php.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | spipu/html2pdf | all versions | 5.2.8composer require spipu/html2pdf:^5.2.8 |
Affected Products
html2pdfhtml2pdf_projectResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for spipu/html2pdf, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update spipu/html2pdf to 5.2.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-39062 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.
Frequently Asked Questions
Is CVE-2023-39062 in your dependencies?
Find it across Packagist, including transitive dependencies.