Security readout for executives and security teams
Plain-English summary
This flaw affects the Marmoset Viewer WordPress plugin before 1.9.3. A web address parameter could be reflected into a page without proper sanitization, allowing browser-executed script if a user opens a malicious link. The sources do not show active exploitation or a CVSS score.
Executive priority
Treat this as a moderate website security issue. Prioritize remediation on public WordPress sites and sites used by administrators, but there is no source-backed evidence of mass exploitation in the provided material.
Technical view
CVE-2021-24495 is a reflected cross-site scripting issue in the WordPress Marmoset Viewer plugin. The vulnerable handling is tied to the id parameter being output without proper sanitization, validation, or escaping. The cited records classify it as CWE-79 and describe versions before 1.9.3 as affected.
Likely exposure
Exposure is limited to WordPress sites using the Marmoset Viewer plugin before 1.9.3. Risk is higher where administrators or authenticated users may follow untrusted links to affected pages.
Exploitation context
No source in the bundle reports known active exploitation, and the CVE is not listed as KEV. Public vulnerability details exist, but this is reflected XSS, so exploitation generally depends on inducing a user to open a maliciously crafted URL.
Researcher notes
The evidence is clear on vulnerability class, affected plugin, and parameter, but incomplete on CVSS, exploit prevalence, and vendor-side remediation detail beyond the before-1.9.3 version boundary. Avoid expanding scope beyond Marmoset Viewer WordPress plugin.
Mitigation direction
- Confirm whether Marmoset Viewer is installed on any WordPress site.
- Update the plugin to the fixed version indicated by vendor or WPScan guidance.
- Remove or disable the plugin if it is unused.
- Review vendor guidance for any additional remediation details.
Validation and detection
- Inventory WordPress plugins and record Marmoset Viewer versions.
- Flag any installation below 1.9.3 for remediation.
- Verify affected pages no longer reflect unsanitized id parameter content.
- Review logs for suspicious requests targeting the id parameter.
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-2021-24495 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://wpscan.com/vulnerability/d11b79a3-f762-49ab-b7c8-3174624d7638CVE reference · x_refsource_MISC
- https://johnjhacking.com/blog/cve-2021-24495-improper-neutralization-of-input-during-web-page-generation-on-id-parameter-in-wordpress-marmoset-viewer-plugin-versions-1.9.3-leads-to-reflected-cross-site-scripting/CVE 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.