As each year the French Security conference SSTIC release a security challenge prior to the conference.

This year the challenge seemed "easier" than the previous year as the stage 1 got 135 validations versus 86 validations in 2022.

This article will detail my solution for the step 0 and the step 1.

I participated as a solo player to angstromctf 2023. I focused on Web challenges.

Lychee is a self-hosted photo-management and gallery. I am using the Lychee application for my personal usage (mostly sharing pictures with the family).

The application has been greatly improved since the last update of my instance. I fired up a docker and start taking a look at the application for new features. It was not long before I found a few XSS, one of them could allow unauthenticated users to to gain logged access to the platform by creating a new account.

I reported the issues to the project and we created a Github Security Advisory: https://github.com/LycheeOrg/Lychee-front/security/advisories/GHSA-cr79-38hg-27gv.

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