Contao CMS up to 5.3.37/5.6.0 information disclosure

Summaryinfo

A vulnerability classified as problematic has been found in Contao CMS up to 5.3.37/5.6.0. This impacts an unknown function. The manipulation leads to information disclosure. This vulnerability is listed as CVE-2025-57757. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Contao CMS up to 5.3.37/5.6.0. It has been rated as problematic. This issue affects some unknown processing. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. The summary by CVE is:

Contao is an Open Source CMS. In versions starting from 5.0.0 and prior to 5.3.38 and 5.6.1, if a news feed contains protected news archives, their news items are not filtered and become publicly available in the RSS feed. This issue has been patched in versions 5.3.38 and 5.6.1. A workaround involves not adding protected news archives to the news feed page.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2025-57757 since 08/19/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

Upgrading to version 5.3.38 or 5.6.1 eliminates this vulnerability. Applying the patch e75f46b11974fbf7a4652e65c19ad6ca84c59271 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). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

• Open Source Contao

Productinfo

Type

• Content Management System

Vendor

• Contao

Name

• CMS

Version

• 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

CVSSv3info

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Exploitinginfo

Threat Intelligenceinfo

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Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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