Security readout for executives and security teams
Plain-English summary
A WordPress plugin called Steam Group Viewer can store unsafe input in its Steam Group Address setting and show it on a page. An authenticated user could use that weakness to run unwanted browser script for visitors or administrators who view the affected page.
Executive priority
Treat this as a targeted website hygiene issue, not a broad emergency. Prioritize internet-facing WordPress sites and sites where many administrators or customers may view affected pages.
Technical view
CVE-2021-24476 is an authenticated stored XSS issue in Steam Group Viewer through version 2.1. The plugin does not sanitize or escape the Steam Group Address setting before page output. The vulnerability is mapped to CWE-79. No CVSS score is provided in the source bundle.
Likely exposure
Exposure is limited to WordPress sites running Steam Group Viewer version 2.1 or earlier, especially where authenticated users can modify plugin settings. The affected vendor is not identified in the source bundle.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation requires authenticated access to the relevant setting, but successful stored XSS can affect later viewers of the page where the setting is rendered.
Researcher notes
Evidence is concise and source-limited: authenticated stored XSS caused by missing sanitization or escaping of one plugin setting. The bundle does not identify a patch level, exploit publication details, CVSS vector, or affected roles beyond authenticated access.
Mitigation direction
- Inventory WordPress sites for Steam Group Viewer and record installed versions.
- Check vendor or WPScan guidance for a fixed or safe replacement version.
- Disable or remove the plugin if it is unused or unsupported.
- Restrict plugin settings access to trusted administrators only.
- Review the Steam Group Address setting for unexpected content.
Validation and detection
- Confirm whether Steam Group Viewer is installed on each WordPress site.
- Verify the installed plugin version is not 2.1 or earlier.
- Check plugin configuration for suspicious Steam Group Address values.
- Review WordPress audit logs for unexpected settings changes.
- Confirm remediation against current vendor or WPScan guidance.
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-2021-24476 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/d1885641-9547-4dd5-84be-ba4a160ee1f5CVE 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.