CVE-2025-57756: Contao is an Open Source CMS

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2025-57756 is a medium-severity flaw (CVSS 5.3) affecting contao. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Contao is an Open Source CMS. In versions starting from 4.9.14 and prior to 4.13.56, 5.3.38, and 5.6.1, protected content elements that are rendered as fragments are indexed and become publicly available in the front end search. This issue has been patched in versions 4.13.56, 5.3.38, and 5.6.1. A workaround involves disabling the front end search.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-200, CWE-612
Published	2025-08-28
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: contao

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-08-28 17:15 UTCPublished CVE record published
2026-06-17 09:43 UTCUpdated Record last modified

contao contao UPGRADE

Affected: >= 4.9.0 and <= 4.9.14 · >= 4.10.0 and < 4.13.56 · >= 5.0.0 and < 5.3.38 · >= 5.4.0 and < 5.6.1

Fixed in: 4.13.56, 5.3.38, 5.6.1

Safe to downgrade to: a release before 4.9.0

1. Check installed version

apt-cache policy contao || rpm -q contao || contao --version

2. UPGRADE to 4.13.56 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade contao

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade contao

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.9.0 (Debian / Ubuntu)

apt-cache madison contao sudo apt install contao=<VERSION_BEFORE_4.9.0> sudo apt-mark hold contao

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list contao sudo dnf downgrade contao-<VERSION_BEFORE_4.9.0> sudo dnf versionlock add contao

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-57756?

contao: upgrade to 4.13.56, 5.3.38, 5.6.1. Exact commands for each OS are on this page.

Is CVE-2025-57756 being exploited?

CVE-2025-57756 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-57756 affect?

CVE-2025-57756 affects contao. Severity is medium (CVSS 5.3). Contao is an Open Source CMS. In versions starting from 4.9.14 and prior to 4.13.56, 5.3.38, and 5.6.1, protected content elements that are rendered as fragments are indexed and become publicly available in the front end search. This issue

How urgent is CVE-2025-57756?

Priority 29/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-65960 MEDIUM 6.6 UPGRADE Contao is an Open Source CMS
CVE-2025-65961 LOW 3.3 UPGRADE Contao is an Open Source CMS
CVE-2025-57759 MEDIUM 4.3 UPGRADE Contao is an Open Source CMS
CVE-2025-57758 MEDIUM 4.3 UPGRADE Contao is an Open Source CMS
CVE-2025-57757 MEDIUM 5.3 UPGRADE Contao is an Open Source CMS

References

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