XSS in Contao
CVE-2023-36806
Contao is an open source content management system. Starting in version 4.0.0 and prior to versions 4.9.42, 4.13.28, and 5.1.10, it is possible for untrusted backend users to inject malicious code into headline fields in the back end, which will be executed both in the element preview (back end) and on the website (front end). Installations are only affected if there are untrusted back end users who have the rights to modify headline fields, or other fields using the input unit widget. Contao 4.9.42, 4.13.28, and 5.1.10 have a patch for this issue. As a workaround, disable the login for all untrusted back end users.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.006 (48.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Contao — versions >= 4.0.0, < 4.9.42, >= 4.10.0, < 4.13.28, >= 5.0.0, < 5.1.10
Weakness classification (CWE)
References
- github.com/contao/contao/security/advisories/GHSA-4gpr-p634-922x (Vendor Advisory)
- github.com/contao/contao/commit/5c9aff32cfc1f7dc452a045862ac2f86a6b9b4b4 (Patch)
- github.com/contao/contao/commit/c98585d36baa25fda69c062421e7e7eadc53c82b (Patch)
- github.com/contao/contao/commit/ccb64c777eb0f9c0e6490c9135d80e915d37cd32 (Patch)
- herolab.usd.de/security-advisories/usd-2023-0020/ (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2023-36806?
- CVE-2023-36806 is a medium-severity vulnerability in Contao, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2023-07-25.
- How severe is CVE-2023-36806?
- Medium severity. CVSS v3 base score is 6.5 out of 10.