melisplatform/melis-cms vulnerable to deserialization of untrusted data

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.