Contao CMS up to 4.13.53/5.3.29/5.5.5 SVG File cross site scripting

Summaryinfo

A vulnerability classified as problematic was found in Contao CMS up to 4.13.53/5.3.29/5.5.5. Affected by this issue is some unknown functionality of the component SVG File Handler. The manipulation results in cross site scripting. This vulnerability was named CVE-2025-29790. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Contao CMS up to 4.13.53/5.3.29/5.5.5. It has been classified as problematic. Affected is an unknown function of the component SVG File Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

Contao is an Open Source CMS. Users can upload SVG files with malicious code, which is then executed in the back end and/or front end. This vulnerability is fixed in Contao 4.13.54, 5.3.30, or 5.5.6.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2025-29790 since 03/11/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 4.13.54, 5.3.30 or 5.5.6 eliminates this vulnerability.

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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
• 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
• 5.5.0
• 5.5.1
• 5.5.2
• 5.5.3
• 5.5.4
• 5.5.5

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