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EUVD-2026-233530

2026-10-18T11:25:49.113136+00:00

EUVD-2026-233530

fkie_cve-2022-39297

2026-10-18T11:25:49.113173+00:00

MelisCms provides a full CMS for Melis Platform, including templating system, drag'n'drop of plugins, SEO and many administration tools. Attackers can deserialize arbitrary data on affected versions of `melisplatform/melis-cms`, and ultimately leads to the execution of arbitrary PHP code on the system. Conducting this attack does not require authentication. Users should immediately upgrade to `melisplatform/melis-cms` >= 5.0.1. This issue was addressed by restricting allowed classes when deserializing user-controlled data.

GHSA-m3m3-6gww-7gj9 — melisplatform/melis-cms vulnerable to deserialization of untrusted data

2026-10-18T11:25:49.113209+00:00

Affected: Packagist: melisplatform/melis-cms

### Impact

Attackers can deserialize arbitrary data on affected versions of `melisplatform/melis-cms`, and ultimately leads to the execution of arbitrary PHP code on the system. Conducting this attack does not require authentication.

Users should immediately upgrade to `melisplatform/melis-cms` >= 5.0.1.

### Patches

This issue was addressed by restricting allowed classes when deserializing user-controlled data.

### References

- https://github.com/melisplatform/melis-cms/commit/d124b2474699a679a24ec52620cadceb3d4cec11

### For more information

If you have any questions or comments about this advisory, you can contact: - The original reporters, by sending an email to vulnerability.research [at] sonarsource.com; - The maintainers, by opening an issue on this repository.

gsd-2022-39297

2026-10-18T11:25:49.113243+00:00

gsd-2022-39297