🛡️ CVE-2023-36806 — contao

🟡 CVSS 6.5 — Medium ⚠️ Exploit Public CWE-79 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Cross site scripting via input unit widget

Impact

Authenticated users can inject malicious code in widgets with units, which is then executed both in the element preview (back end) and on the website (front end).

Patches

Update to Contao 4.9.42, 4.13.28 or 5.1.10.

Workarounds

Disable login for all untrusted back end users.

References

https://contao.org/en/security-advisories/cross-site-scripting-in-widgets-with-units

For more information

If you have any questions or comments about this advisory, open an issue in [contao/contao](https://github.com/contao/contao/issues/new/choose).

Credits

Thanks to Christian Pöschl and Fabian Brenner from usd AG for reporting this vulnerability.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality low, integrity low, availability low.

Weakness class

CVE-2023-36806 is classified as CWE-79: Cross-site Scripting (XSS). User-supplied data is written into a page without escaping, so attacker script runs in the browser of anyone who views it.

Affected software

CVE-2023-36806 is recorded against 2 packages.

  • contao (from 5.0.0 up to 5.1.10)
  • contao/core-bundle (from 5.0.0 up to 5.1.10)

Timeline and source

Published on 25 July 2023 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
github.com
github.com
github.com
herolab.usd.de
github.com
github.com
github.com
github.com
herolab.usd.de

Details

Severity MEDIUM
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
CWE CWE-79
Public Exploit ⚠️ Yes
Source NVD
Published 2023-07-25
Updated 2026-08-12
Modified 2026-06-17

Affected Packages

Software From version Fixed in
contao 5.0.0 5.1.10
contao/core-bundle 5.0.0 5.1.10

References

Similar Threats

Exploit Protection

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CVE-2023-36806 carries CVSS 6.5 Medium rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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