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Cross-site scripting in templates

Low
leofeyer published GHSA-68q5-78xp-cwwc Nov 25, 2025

Package

composer contao/core-bundle (Composer)

Affected versions

>=4.0.0

Patched versions

4.13.57, 5.3.42, 5.6.5

Description

Impact

It is possible to inject code into the template output that will be executed in the browser in the front end and back end.

Patches

Update to Contao 4.13.57, 5.3.42 or 5.6.5

Workarounds

Do not use the affected templates or patch them manually.

References

https://contao.org/en/security-advisories/cross-site-scripting-in-templates

Severity

Low

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
Low
Integrity
Low
Availability
None

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:L/I:L/A:N

CVE ID

CVE-2025-65961

Weaknesses

Improper Neutralization of Alternate XSS Syntax

The product does not neutralize or incorrectly neutralizes user-controlled input for alternate script syntax. Learn more on MITRE.

Credits