Contao CMS up to 4.13.55/5.3.37/5.6.0 information disclosure

Summaryinfo

A vulnerability was found in Contao CMS up to 4.13.55/5.3.37/5.6.0 and classified as problematic. This vulnerability affects unknown code. Executing a manipulation can lead to information disclosure. This vulnerability appears as CVE-2025-57756. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Contao CMS up to 4.13.55/5.3.37/5.6.0 and classified as problematic. This vulnerability affects an unknown code. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

Contao is an Open Source CMS. In versions starting from 4.9.14 and prior to 4.13.56, 5.3.38, and 5.6.1, protected content elements that are rendered as fragments are indexed and become publicly available in the front end search. This issue has been patched in versions 4.13.56, 5.3.38, and 5.6.1. A workaround involves disabling the front end search.

The advisory is shared for download at github.com. This vulnerability was named CVE-2025-57756 since 08/19/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 4.13.56, 5.3.38 or 5.6.1 eliminates this vulnerability. Applying the patch a03976c459b6f3985a28f6488b82a76ffb6c0514 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2025-1920). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Open Source Contao

Productinfo

Type

• Content Management System

Vendor

• Contao

Name

• CMS

Version

• 4.13.0
• 4.13.1
• 4.13.2
• 4.13.3
• 4.13.4
• 4.13.5
• 4.13.6
• 4.13.7
• 4.13.8
• 4.13.9
• 4.13.10
• 4.13.11
• 4.13.12
• 4.13.13
• 4.13.14
• 4.13.15
• 4.13.16
• 4.13.17
• 4.13.18
• 4.13.19
• 4.13.20
• 4.13.21
• 4.13.22
• 4.13.23
• 4.13.24
• 4.13.25
• 4.13.26
• 4.13.27
• 4.13.28
• 4.13.29
• 4.13.30
• 4.13.31
• 4.13.32
• 4.13.33
• 4.13.34
• 4.13.35
• 4.13.36
• 4.13.37
• 4.13.38
• 4.13.39
• 4.13.40
• 4.13.41
• 4.13.42
• 4.13.43
• 4.13.44
• 4.13.45
• 4.13.46
• 4.13.47
• 4.13.48
• 4.13.49
• 4.13.50
• 4.13.51
• 4.13.52
• 4.13.53
• 4.13.54
• 4.13.55
• 5.0
• 5.1
• 5.2
• 5.3
• 5.3.0
• 5.3.1
• 5.3.2
• 5.3.3
• 5.3.4
• 5.3.5
• 5.3.6
• 5.3.7
• 5.3.8
• 5.3.9
• 5.3.10
• 5.3.11
• 5.3.12
• 5.3.13
• 5.3.14
• 5.3.15
• 5.3.16
• 5.3.17
• 5.3.18
• 5.3.19
• 5.3.20
• 5.3.21
• 5.3.22
• 5.3.23
• 5.3.24
• 5.3.25
• 5.3.26
• 5.3.27
• 5.3.28
• 5.3.29
• 5.3.30
• 5.3.31
• 5.3.32
• 5.3.33
• 5.3.34
• 5.3.35
• 5.3.36
• 5.3.37
• 5.4
• 5.5
• 5.6.0

License

• open-source

CPE 2.3info

• 🔒
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CPE 2.2info

• 🔒
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CVSSv4info

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Exploitinginfo

Threat Intelligenceinfo

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Sourcesinfo

Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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