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Contao discloses sensitive information in the front end search index

Moderate severity GitHub Reviewed Published Aug 28, 2025 in contao/contao • Updated Aug 28, 2025

Package

composer contao/contao (Composer)

Affected versions

>= 4.9.14, < 4.13.56
>= 5.0.0-RC1, < 5.3.38
>= 5.4.0-RC1, < 5.6.1

Patched versions

4.13.56
5.3.38
5.6.1
composer contao/core-bundle (Composer)
>= 4.9.14, < 4.13.56
>= 5.0.0-RC1, < 5.3.38
>= 5.4.0-RC1, < 5.6.1
4.13.56
5.3.38
5.6.1

Description

Impact

Protected content elements that are rendered as fragments are indexed and become publicly available in the front end search.

Patches

Update to Contao 4.13.56, 5.3.38 or 5.6.1.

Workarounds

Disable the front end search.

For more information

If you have any questions or comments about this advisory, open an issue in contao/contao.

References

@leofeyer leofeyer published to contao/contao Aug 28, 2025
Published to the GitHub Advisory Database Aug 28, 2025
Reviewed Aug 28, 2025
Published by the National Vulnerability Database Aug 28, 2025
Last updated Aug 28, 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
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
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:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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.
(11th percentile)

Weaknesses

Exposure of Sensitive Information to an Unauthorized Actor

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Learn more on MITRE.

Improper Authorization of Index Containing Sensitive Information

The product creates a search index of private or sensitive documents, but it does not properly limit index access to actors who are authorized to see the original information. Learn more on MITRE.

CVE ID

CVE-2025-57756

GHSA ID

GHSA-2xmj-8wmq-7475

Source code

Credits

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