Security readout for executives and security teams
Plain-English summary
A WordPress plugin flaw can let an unauthenticated visitor change metadata on some posts or pages. This is mainly an integrity risk: content, settings, or plugin-managed post data could be altered without login. The provided sources rate it medium, not business-ending, but internet-facing WordPress sites should treat it as prompt patch work.
Executive priority
Prioritize remediation on public WordPress properties, especially sites where post metadata controls content, access, downloads, or page behavior. This is a moderate urgency integrity issue, not currently evidenced as actively exploited in the supplied sources.
Technical view
Frontend File Manager for WordPress through version 18.2 lacks authentication, capability checks, and sanitization on the wpfm_file_meta_update AJAX action. The CVE maps to CWE-862 and CVSS 5.8, with network access, low complexity, no privileges, no user interaction, changed scope, and low integrity impact.
Likely exposure
Exposure is limited to WordPress sites running the Frontend File Manager plugin at versions up to and including 18.2. Public WordPress sites are the main concern because the vulnerable action is unauthenticated.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation evidence. The vulnerability is still practical because it is remotely reachable, requires no login, and has low attack complexity. No exploit steps are needed to assess risk.
Researcher notes
The source bundle has inconsistent affected metadata, but the CVE description clearly states versions up to and including 18.2. Avoid broadening impact beyond post or page metadata changes without additional vendor evidence.
Mitigation direction
- Identify any Frontend File Manager installations and confirm plugin version.
- Upgrade according to vendor or plugin advisory guidance for releases after 18.2.
- Disable the plugin until patched if affected and business use is nonessential.
- Review Wordfence and Nintechnet advisories for any vendor-specific cleanup guidance.
Validation and detection
- Check WordPress plugin inventory for Frontend File Manager version 18.2 or earlier.
- Confirm whether the plugin is active on public-facing WordPress sites.
- Review web logs for unexpected requests referencing wpfm_file_meta_update.
- Inspect recent post and page metadata changes for unauthorized or unusual updates.
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-2021-4351 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
- Medium
- CVSS
- 5.8 (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: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:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.8MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
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.