Security readout for executives and security teams
Plain-English summary
A vulnerable WordPress plugin can let outsiders use an affected site to send spam-like email with custom recipients, subjects, and HTML body content. This is not described as data theft, but it can damage mail reputation, disrupt operations, and create abuse complaints for the site owner.
Executive priority
Prioritize remediation for public WordPress sites using this plugin because the issue enables unauthenticated email abuse. Business urgency is mainly mail reputation, customer trust, and operational disruption rather than confirmed system takeover.
Technical view
CVE-2021-4350 affects nmedia Frontend File Manager for WordPress through version 18.2. The wpfm_send_file_in_email AJAX action lacks authentication checks, allowing unauthenticated users to submit email fields with unsanitized HTML. The issue is mapped to CWE-862 and scored CVSS 7.2.
Likely exposure
Exposure is likely limited to WordPress sites running the Frontend File Manager plugin at version 18.2 or earlier. The provided affected metadata is sparse, so confirm installed plugin name, vendor, and version directly from each site.
Exploitation context
The bundle does not identify CISA KEV listing or active exploitation. The described abuse path is unauthenticated and network-accessible, so internet-facing WordPress sites with the plugin enabled should be treated as practically reachable until verified or remediated.
Researcher notes
The core defect is missing authorization on an AJAX email action, with unsanitized HTML accepted into the message body. Source evidence supports spam relay impact, low attack complexity, and no required privileges. It does not support claims of active exploitation or broader compromise.
Mitigation direction
- Upgrade Frontend File Manager beyond version 18.2 if a vendor-supported fixed release is available.
- Disable or remove the plugin if it cannot be promptly updated.
- Review vendor and plugin security advisories for exact fixed-version guidance.
- Monitor outbound mail reputation, bounce rates, and abuse reports from affected sites.
- Restrict unnecessary email-sending functionality where operationally feasible.
Validation and detection
- Inventory WordPress sites for the Frontend File Manager plugin and installed version.
- Confirm whether any installation is version 18.2 or earlier.
- Review web logs for unexpected requests involving wpfm_send_file_in_email.
- Review mail logs for unusual recipients, subjects, or HTML-heavy outbound messages.
- After remediation, verify unauthenticated users cannot trigger plugin email-sending behavior.
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-862: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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 lookupCVE-2021-4350 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
- 7.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
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:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L3.92.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
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.
Missing Authorization
Missing Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.