Security readout for executives and security teams
Plain-English summary
CVE-2021-38359 is a reflected cross-site scripting issue in the WordPress InviteBox Refer-a-Friend plugin. An attacker could trick a user into opening a crafted request that runs script in that user's browser on the affected site. Sources rate this medium severity and do not show active exploitation.
Executive priority
Treat this as a moderate WordPress hygiene issue. It is not shown as actively exploited in the provided sources, but XSS against administrator sessions can create business risk. Confirm whether the plugin exists in production and remove or update it promptly.
Technical view
The vulnerability is CWE-79 reflected XSS through the message parameter in ~/admin/admin.php in InviteBox plugin versions up to and including 1.4.1. CVSS 3.1 is 6.1 with network access, low complexity, no privileges, required user interaction, changed scope, and low confidentiality and integrity impact.
Likely exposure
Exposure is limited to WordPress sites that installed the InviteBox Refer-a-Friend plugin at version 1.4.1 or earlier. The bundle does not identify affected CPEs, install counts, a fixed version, or whether the plugin remains maintained.
Exploitation context
The source bundle does not report CISA KEV listing or active exploitation. Practical exploitation requires user interaction, typically convincing a victim to open a crafted request. Because it is reflected XSS, impact depends on the victim's privileges and browser session on the WordPress site.
Researcher notes
Evidence is concise: CVE metadata, Wordfence advisory reference, and WordPress Trac source for the affected 1.4.1 file. The bundle names the vulnerable parameter and file but does not provide a patch reference, exploit status, or comprehensive version history.
Mitigation direction
- Inventory WordPress sites for the InviteBox Refer-a-Friend plugin.
- Confirm whether installed versions are 1.4.1 or earlier.
- Check Wordfence and vendor guidance for update or retirement direction.
- Disable or remove the plugin if no maintained fix is available.
- Prioritize sites with administrative users or sensitive WordPress workflows.
Validation and detection
- Review plugin inventory from WordPress administration or asset records.
- Confirm the installed plugin version against the affected range.
- Inspect whether ~/admin/admin.php contains the referenced message parameter behavior.
- Review web logs for unusual requests involving the message parameter.
- Verify remediation by confirming the vulnerable plugin is updated, disabled, or removed.
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-79: 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-2021-38359 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
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/vulnerability-advisories/#CVE-2021-38359CVE reference · x_refsource_MISC
- https://plugins.trac.wordpress.org/browser/refer-a-friend-widget-for-wp/tags/1.4.1/admin/admin.php#L75CVE reference · x_refsource_MISC
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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.