Security readout for executives and security teams
Plain-English summary
CVE-2021-47746 affects NodeBB Plugin Emoji 3.2.1. An authenticated administrator can abuse the emoji upload API to write files outside the intended upload location. This matters most where NodeBB admin accounts are numerous, weakly protected, or shared, because compromise of an admin account could become broader server impact.
Executive priority
Prioritize remediation for public or business-critical NodeBB forums. The vulnerability requires admin access, but impact can be severe if an admin account is compromised. Treat as high priority for systems with exposed admin panels or weak administrator controls.
Technical view
The issue is an arbitrary file write caused by externally controlled file path handling, mapped to CWE-73. Sources describe directory traversal through a file path parameter in the emoji upload API. CVSS v4.0 is 8.6 high, with network access, low complexity, high privileges required, no user interaction, and high vulnerable-system confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to environments running NodeBB Plugin Emoji version 3.2.1, especially internet-accessible NodeBB instances where the plugin is installed and administrative access exists. The sources do not establish that other versions are affected.
Exploitation context
A public Exploit-DB entry is referenced, so proof-of-concept information appears publicly available. The source bundle does not indicate CISA KEV listing or confirmed active exploitation. Exploitation requires administrative privileges, reducing opportunistic risk but increasing concern after admin credential theft.
Researcher notes
Evidence comes from the CVE record, VulnCheck advisory, Exploit-DB reference, and project sources. The bundle names only NodeBB Plugin Emoji 3.2.1. No source-provided patch version or official mitigation is included, so remediation should be verified against current vendor guidance.
Mitigation direction
- Inventory NodeBB deployments and confirm whether nodebb-plugin-emoji version 3.2.1 is installed.
- Review the plugin GitHub repository and vendor guidance for a fixed version or recommended workaround.
- Restrict NodeBB administrative access to trusted users and protected networks where feasible.
- Enforce strong authentication and MFA for NodeBB administrator accounts.
- Back up and monitor critical system files on hosts running affected NodeBB instances.
Validation and detection
- Check installed NodeBB plugins and record the nodebb-plugin-emoji version.
- Review NodeBB admin audit logs for unusual emoji upload activity.
- Inspect application and server logs for path traversal indicators in upload requests.
- Verify file ownership and unexpected modifications near NodeBB and system paths.
- Confirm remediation by comparing deployed plugin version against vendor or advisory guidance.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-73: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-47746 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.6 (4.0)
- Known Exploited
- No
- Published
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
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
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——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.6HighVector: 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
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-49813CVE reference · exploit
- Official NodeBB HomepageCVE reference · product
- NodeBB Emoji Plugin GitHub RepositoryCVE reference · product
- VulnCheck Advisory: NodeBB Plugin Emoji 3.2.1 - Arbitrary File WriteCVE reference · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
External Control of File Name or Path
External Control of File Name or Path represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.