Security readout for executives and security teams
Plain-English summary
CVE-2021-38317 affects the Konnichiwa! Membership WordPress plugin through version 0.8.3. A crafted link could make a visitor's browser run attacker-controlled script in the site context. This requires user interaction, so urgency is moderate, but risk rises for sites with administrator sessions or sensitive membership data.
Executive priority
Treat as a moderate web application risk. It is not listed as actively exploited in the provided sources, but affected membership sites should be remediated because browser-executed script can undermine user trust and session security.
Technical view
The issue is reflected cross-site scripting in the plan_id parameter handled by views/subscriptions.html.php. The CVSS 3.1 score is 6.1 with network access, low attack complexity, no privileges required, and user interaction required. Scope changes, with low confidentiality and integrity impact and no availability impact. CWE-79 is listed.
Likely exposure
Exposure is limited to WordPress sites running Konnichiwa! Membership versions up to and including 0.8.3. The source bundle does not identify other affected products, CPEs, hosting platforms, or downstream packages.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation evidence. Exploitation would depend on persuading a user to open attacker-controlled content that reflects script through the vulnerable parameter. No weaponized exploit details are needed for validation.
Researcher notes
Evidence supports reflected XSS tied to plan_id in subscriptions.html.php for Konnichiwa! Membership through 0.8.3. Patch availability is not established in the supplied bundle, so remediation should be tied to current vendor or Wordfence guidance rather than assumed fixed versions.
Mitigation direction
- Inventory WordPress sites for Konnichiwa! Membership installations and installed versions.
- Prioritize removal, disabling, or vendor-approved updating of versions up to 0.8.3.
- Check Wordfence and plugin vendor guidance for a fixed release or official workaround.
- Limit administrator exposure to untrusted links until vulnerable installations are remediated.
Validation and detection
- Confirm whether the plugin is installed on each WordPress site.
- Record the installed Konnichiwa! Membership version and compare it with 0.8.3 or earlier.
- Review Wordfence advisory status for current remediation guidance.
- Verify remediation by confirming the vulnerable plugin version is no longer deployed.
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-2021-38317 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-2021-38317CVE reference · x_refsource_MISC
- https://plugins.trac.wordpress.org/browser/konnichiwa/trunk/views/subscriptions.html.php?rev=1625922#L7CVE 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.