How severe is CVE-2023-36806?

CVE-2023-36806 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2023-36806 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-36806?

CVE-2023-36806 affects Contao. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-36806?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-36806 published?

CVE-2023-36806 was published on 2023-07-25 and last updated on 2026-06-17.

CVE-2023-36806

CVE-2023-36806 is a medium-severity vulnerability in Contao with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Contao
Published: 2023-07-25
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2023-36806?: CVE-2023-36806 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2023-36806 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-36806?: CVE-2023-36806 affects Contao. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-36806?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-36806 published?: CVE-2023-36806 was published on 2023-07-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:contao:contao:*:*:*:*:*:*:*:*

More vulnerabilities in Contao

CVE-2022-26265 — Critical (CVSS 9.8): Contao Managed Edition v1.5.0 was discovered to contain a remote command execution (RCE) vulnerability via the…
CVE-2019-11512 — Critical (CVSS 9.8): Contao 4.x allows SQL Injection. Fixed in Contao 4.4.39 and Contao 4.7.5.
CVE-2012-4383 — High (CVSS 8.8): contao prior to 2.11.4 has a sql injection vulnerability
CVE-2019-19745 — High (CVSS 8.8): Contao 4.0 through 4.8.5 allows PHP local file inclusion. A back end user with access to the form generator can upload…
CVE-2024-45398 — High (CVSS 8.3): Contao is an Open Source CMS. In affected versions a back end user with access to the file manager can upload malicious…
CVE-2024-28235 — High (CVSS 8.3): Contao is an open source content management system. Starting in version 4.9.0 and prior to versions 4.13.40 and 5.3.4,…

All CVEs affecting Contao →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →