CVE-2021-43787
XSS via prototype pollution in NodeBB
Description
### Impact 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. ### Patches The vulnerability has been patched as of v1.18.5. ### Workarounds Cherry-pick commit hash 1783f918bc19568f421473824461ff2ed7755e4c to receive this patch in lieu of a full upgrade. ### For more information If you have any questions or comments about this advisory: * Email us at [security@nodebb.org](mailto:security@nodebb.org)
How to fix CVE-2021-43787
To remediate CVE-2021-43787, upgrade the affected package to a fixed version below.
- —upgrade to 1.18.5 or later
Is CVE-2021-43787 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 1.15.0, < 1.18.5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H |