Contao 5.3 (LTS)
Contao 5.3 (LTS)
Third-party support for the Contao 5.3 (LTS): 24/7 engineers manage issues, remediate vulnerabilities, and help you maintain compliance — independent of the vendor contract.
24/7 engineers own your Contao 5.3 (LTS) incidents end to end.
Mitigation and patch-around guidance when the vendor no longer ships fixes.
Controls evidence and documentation that keep auditors satisfied.
Specifications
- product
- contao
- release
- 5.3
- product Label
- Contao
- release Label
- 5.3 (LTS)
- codename
- lts
- true
- latest Version
- 5.3.50
- release Date
- 2024-02-16
- maintained
- true
- source Url
- https://endoflife.date/contao
Lifecycle Dates
- End of Service Life
- Feb 14, 2028
- Last OEM Support
- Feb 14, 2027
OEM vs. 3rd Party Support
See how third-party support compares to the vendor contract for Contao 5.3 (LTS) — monitoring, break/fix, vulnerability work, operations and compliance, before and after EOSL.
| Feature | OEM Support | 3rd Party Support |
|---|---|---|
| Post-EOSL Support | ||
| Break/Fix Support | Until EOSL | |
| 24/7 Monitoring | ||
| Vulnerability Scanning & Remediation | ||
| Managed Operations | ||
| Procedure & Configuration Review | ||
| Compliance & Audit Documentation | Limited | |
| Discounted Migration to Other Platforms |
Why Choose 3rd Party Support for Contao 5.3 (LTS)?
Vulnerability Remediation
Scanning, mitigation and patch-around guidance for Contao 5.3 (LTS) when the vendor no longer ships fixes.
Compliance Maintenance
Procedure review, controls evidence and the documentation auditors ask for — maintained continuously, not scrambled at audit time.
24/7 Expert Support
Engineers who know this release monitor, manage and fix issues around the clock — break/fix to managed operations.
Contao 5.3 (LTS) Support: Frequently Asked Questions
Is the Contao 5.3 (LTS) still supported?
Yes. The Contao 5.3 (LTS) is currently supported by Contao, and third-party support is available as an alternative — issue management, vulnerability remediation, and compliance help independent of the vendor contract.
When is the Contao 5.3 (LTS) end of service life (EOSL) date?
Contao lists the end of service life for the Contao 5.3 (LTS) as Feb 14, 2028.
Can I keep using the Contao 5.3 (LTS) after its EOSL date?
Yes. EOSL means Contao stops issuing patches and support — the software itself keeps running. Third-party support covers it from there: issue management, security vulnerability remediation, and the compliance documentation auditors ask for, for as long as you choose to run it.
How much does third-party support for the Contao 5.3 (LTS) cost?
Typically 40-70% below the OEM maintenance renewal price. Exact pricing depends on quantity, service level and location — request a quote and we respond within 24 hours.
Known Vulnerabilities Affecting Contao 5.3 (LTS)
14 published CVEs affect the Contao 5.3 (LTS), including 2 rated critical or high severity. Our 24/7 engineers help you assess exposure, prioritize fixes and apply available patches.
| CVE | Severity | CVSS | Published | Summary |
|---|---|---|---|---|
| CVE-2024-45398 | HIGH | 8.3 | Sep 17, 2024 | Contao is an Open Source CMS. In affected versions a back end user with access to the file manager can upload malicious files and execute them on the server. Users are advised to update to Contao 4.13.49, 5.3.15 or 5.4.3. Users unable to update are advised to configure their web server so it does not execute PHP files and other scripts in the Contao file upload directory. |
| CVE-2024-28235 | HIGH | 8.3 | Apr 9, 2024 | Contao is an open source content management system. Starting in version 4.9.0 and prior to versions 4.13.40 and 5.3.4, when checking for broken links on protected pages, Contao sends the cookie header to external urls as well, the passed options for the http client are used for all requests. Contao versions 4.13.40 and 5.3.4 have a patch for this issue. As a workaround, disable crawling protected pages. |
| CVE-2025-65960 | MEDIUM | 6.6 | Nov 25, 2025 | Contao is an Open Source CMS. From version 4.0.0 to before 4.13.57, before 5.3.42, and before 5.6.5, back end users with precise control over the contents of template closures can execute arbitrary PHP functions that do not have required parameters. This issue has been patched in versions 4.13.57, 5.3.42, and 5.6.5. A workaround for this issue involves manually patching the Contao\Template::once() method. |
| CVE-2024-45965 | MEDIUM | 6.4 | Oct 2, 2024 | Contao before 5.5.6 allows XSS via an SVG document. This affects (in contao/core-bundle in Composer) 4.x before 4.13.54, 5.0.x through 5.3.x before 5.3.30, and 5.4.x and 5.5..x before 5.5.6. |
| CVE-2024-28190 | MEDIUM | 5.4 | Apr 9, 2024 | Contao is an open source content management system. Starting in version 4.0.0 and prior to version 4.13.40 and 5.3.4, users can inject malicious code in filenames when uploading files (back end and front end), which is then executed in tooltips and popups in the back end. Contao versions 4.13.40 and 5.3.4 have a patch for this issue. As a workaround, remove upload fields from frontend forms and disable uploads for untrusted back end users. |
| CVE-2025-57757 | MEDIUM | 5.3 | Aug 28, 2025 | Contao is an Open Source CMS. In versions starting from 5.0.0 and prior to 5.3.38 and 5.6.1, if a news feed contains protected news archives, their news items are not filtered and become publicly available in the RSS feed. This issue has been patched in versions 5.3.38 and 5.6.1. A workaround involves not adding protected news archives to the news feed page. |
| CVE-2025-57756 | MEDIUM | 5.3 | Aug 28, 2025 | 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. |
| CVE-2024-45612 | MEDIUM | 5.3 | Sep 17, 2024 | Contao is an Open Source CMS. In affected versions an untrusted user can inject insert tags into the canonical tag, which are then replaced on the web page (front end). Users are advised to update to Contao 4.13.49, 5.3.15 or 5.4.3. Users unable to upgrade should disable canonical tags in the root page settings. |
| CVE-2025-29790 | MEDIUM | 4.8 | Mar 18, 2025 | 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. |
| CVE-2025-57759 | MEDIUM | 4.3 | Aug 28, 2025 | Contao is an Open Source CMS. In versions starting from 5.3.0 and prior to 5.3.38 and 5.6.1, under certain conditions, back end users may be able to edit fields of pages and articles without having the necessary permissions. This issue has been patched in versions 5.3.38 and 5.6.1. There are no workarounds. |
| CVE-2025-57758 | MEDIUM | 4.3 | Aug 28, 2025 | Contao is an Open Source CMS. In versions starting from 5.0.0 and prior to 5.3.38 and 5.6.1, the table access voter in the back end doesn't check if a user is allowed to access the corresponding module. This issue has been patched in versions 5.3.38 and 5.6.1. A workaround involves not relying solely on the voter and additionally to check USER_CAN_ACCESS_MODULE. |
| CVE-2024-28234 | MEDIUM | 4.3 | Apr 9, 2024 | Contao is an open source content management system. Starting in version 2.0.0 and prior to versions 4.13.40 and 5.3.4, it is possible to inject CSS styles via BBCode in comments. Installations are only affected if BBCode is enabled. Contao versions 4.13.40 and 5.3.4 have a patch for this issue. As a workaround, disable BBCode for comments. |
| CVE-2025-65961 | LOW | 3.3 | Nov 25, 2025 | Contao is an Open Source CMS. From version 4.0.0 to before 4.13.57, before 5.3.42, and before 5.6.5, it is possible to inject code into the template output that will be executed in the browser in the front end and back end. This issue has been patched in versions 4.13.57, 5.3.42, and 5.6.5. A workaround for this issue involves not using the affected templates or patch them manually. |
| CVE-2024-28191 | LOW | 3.1 | Apr 9, 2024 | Contao is an open source content management system. Starting in version 4.0.0 and prior to version 4.13.40 and 5.3.4, it is possible to inject insert tags in frontend forms if the output is structured in a very specific way. Contao versions 4.13.40 and 5.3.4 have a patch for this issue. As a workaround, do not output user data from frontend forms next to each other, always separate them by at least one character. |