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Contao is vulnerable to remote code execution in template closures

Moderate severity GitHub Reviewed Published Nov 25, 2025 in contao/contao • Updated Nov 27, 2025

Package

composer contao/core-bundle (Composer)

Affected versions

>= 4.0.0, < 4.13.57
>= 5.0.0-RC1, < 5.3.42
>= 5.4.0-RC1, < 5.6.5

Patched versions

4.13.57
5.3.42
5.6.5

Description

Impact

Backend users with precise control over the contents of template closures can execute arbitrary PHP functions that do not have required parameters.

Patches

Update to Contao 4.13.57, 5.3.42 or 5.6.5

Workarounds

Manually patch the Contao\Template::once() method.

Resources

https://contao.org/en/security-advisories/remote-code-execution-in-template-closures

References

@leofeyer leofeyer published to contao/contao Nov 25, 2025
Published by the National Vulnerability Database Nov 25, 2025
Published to the GitHub Advisory Database Nov 25, 2025
Reviewed Nov 25, 2025
Last updated Nov 27, 2025

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(3rd percentile)

Weaknesses

Insufficient Type Distinction

The product does not properly distinguish between different types of elements in a way that leads to insecure behavior. Learn more on MITRE.

CVE ID

CVE-2025-65960

GHSA ID

GHSA-98vj-mm79-v77r

Source code

Credits

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