Contao CMS up to 4.13.56/5.3.41/5.6.4 Template::once Required type distinction

Summaryinfo

A vulnerability categorized as problematic has been discovered in Contao CMS up to 4.13.56/5.3.41/5.6.4. Affected is the function Template::once. Such manipulation of the argument Required leads to type distinction. This vulnerability is referenced as CVE-2025-65960. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Contao CMS up to 4.13.56/5.3.41/5.6.4. It has been rated as problematic. Affected by this issue is the function Template::once. The manipulation of the argument required with an unknown input leads to a type distinction vulnerability. Using CWE to declare the problem leads to CWE-351. The product does not properly distinguish between different types of elements in a way that leads to insecure behavior. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Contao is an Open Source CMS. From version 4.0.0 to before 4.13.57, before 5.3.42, and before 5.6.5, back end users with precise control over the contents of template closures can execute arbitrary PHP functions that do not have required parameters. This issue has been patched in versions 4.13.57, 5.3.42, and 5.6.5. A workaround for this issue involves manually patching the Contao\Template::once() method.

The advisory is available at github.com. This vulnerability is handled as CVE-2025-65960 since 11/18/2025. The exploitation is known to be difficult. The attack may be launched remotely. The exploitation requires an enhanced level of successful authentication. Technical details are known, but there is no available exploit.

Upgrading to version 4.13.57, 5.3.42 or 5.6.5 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-199633). If you want to get best quality of vulnerability data, you may have to visit VulDB.

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
• 4.13.56
• 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
• 5.3.38
• 5.3.39
• 5.3.40
• 5.3.41
• 5.6.0
• 5.6.1
• 5.6.2
• 5.6.3
• 5.6.4

CPE 2.3info

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CPE 2.2info

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CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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