Security fixes

[RiccardoM]

Description

Fixes a bunch of security problems

Checklist

• [ ] Targeted PR against correct branch.
• [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• [ ] Wrote unit tests.
• [ ] Run flutter format.
• [ ] Updated the documentation.
• [ ] Added an entry to the CHANGELOG.md file.
• [ ] Re-reviewed Files changed in the Github PR explorer.

[codecov[bot]]

Codecov Report

Merging #125 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #125   +/-   ##
=======================================
  Coverage   61.29%   61.29%           
=======================================
  Files         262      262           
  Lines        6601     6601           
=======================================
  Hits         4046     4046           
  Misses       2555     2555           

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 2bc80f9...c6bb480. Read the comment docs.