Security readout for executives and security teams
Plain-English summary
CVE-2021-4399 is a CSRF issue in the Edwiser Bridge WordPress Moodle integration. If an administrator can be tricked into clicking a crafted link while logged in, unauthorized plugin actions may run. The reported impact is limited to integrity, with no confidentiality or availability impact stated.
Executive priority
Treat as a scheduled remediation item, not an emergency, unless the plugin supports critical Moodle operations on high-value sites. Prioritize upgrade validation across WordPress assets because exploitation can alter plugin behavior through administrator interaction.
Technical view
Versions up to and including 2.0.6 lack or incorrectly validate nonces in several synchronization, connection test, admin menu, and subscription handler functions. The CVSS 3.1 score is 4.3 with network access, low complexity, no privileges, required user interaction, and low integrity impact.
Likely exposure
Exposure is limited to WordPress sites running Edwiser Bridge through 2.0.6. Risk increases when privileged administrators are authenticated and can be induced to follow attacker-controlled links or requests.
Exploitation context
The supplied sources do not show KEV listing or confirmed active exploitation. Exploitation requires administrator interaction and relies on CSRF behavior, not direct unauthenticated takeover by itself.
Researcher notes
The evidence identifies affected versions through 2.0.6 and names specific functions with missing or incorrect nonce validation. The affected metadata in the bundle is sparse, so avoid extending impact beyond Edwiser Bridge without additional vendor confirmation.
Mitigation direction
- Upgrade Edwiser Bridge beyond affected versions using official WordPress or vendor guidance.
- If upgrade timing is uncertain, temporarily disable the plugin where business impact allows.
- Limit administrator browsing while logged into WordPress admin sessions.
- Review vendor notes and the referenced WordPress Trac changeset for nonce-validation fixes.
Validation and detection
- Inventory WordPress sites for Edwiser Bridge and record installed versions.
- Confirm whether any instance runs version 2.0.6 or older.
- Review plugin code or release notes for nonce validation on listed functions.
- Check web and admin logs for suspicious administrator-triggered plugin actions.
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-352: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2021-4399 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
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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:R/S:U/C:N/I:L/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/6450dafd-5992-4831-87af-e5e47cc8663e?source=cveCVE reference
- https://blog.nintechnet.com/25-wordpress-plugins-vulnerable-to-csrf-attacks/CVE reference
- https://blog.nintechnet.com/more-wordpress-plugins-and-themes-vulnerable-to-csrf-attacks/CVE reference
- https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-3/CVE reference
- https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-2/CVE reference
- https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-1/CVE reference
- https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-5/CVE reference
- https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-4/CVE reference
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2478642%40edwiser-bridge&new=2478642%40edwiser-bridge&sfp_email=&sfph_mail=CVE reference
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.
Cross-Site Request Forgery (CSRF)
Cross-Site Request Forgery (CSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.