A prototype pollution vulnerability in the uploader module allowed a malicious user to inject arbitrary data (i.e. javascript) into the DOM, theoretically allowing for an account takeover when used in conjunction with a path traversal vulnerability disclosed at the same time as this report.
The vulnerability has been patched as of v1.18.5.
Cherry-pick commit hash 1783f918bc19568f421473824461ff2ed7755e4c to receive this patch in lieu of a full upgrade.
If you have any questions or comments about this advisory:
blog.sonarsource.com/nodebb-remote-code-execution-with-one-shot
github.com/NodeBB/NodeBB
github.com/NodeBB/NodeBB/commit/1783f918bc19568f421473824461ff2ed7755e4c
github.com/NodeBB/NodeBB/releases/tag/v1.18.5
github.com/NodeBB/NodeBB/security/advisories/GHSA-wx69-rvg3-x7fc
nvd.nist.gov/vuln/detail/CVE-2021-43787