🛡️ CVE-2023-36806 — contao
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
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
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
- Medium CVE-2025-65960
- Low CVE-2025-65961
- Medium CVE-2025-57756
- Medium CVE-2025-57757
- Medium CVE-2025-57758
More CVE 2023 advisories
Browse all of CVE 2023 in the advisory index.
Exploit Protection
Are you running contao?
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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