Security readout for executives and security teams
Plain-English summary
This issue affects WordPress sites using WP Fastest Cache before 0.9.5. An attacker could trick a logged-in administrator or similar high-privilege user into saving malicious plugin settings, leading to stored cross-site scripting on the site.
Executive priority
Treat as a moderate website integrity risk. Prioritize internet-facing WordPress sites and business-critical sites where admin compromise or visitor trust damage would have operational impact.
Technical view
The wpfc_save_cdn_integration AJAX action lacked CSRF protection and did not sanitize or escape some option values. The flaw combines CWE-352 and CWE-79, requiring user interaction by a logged-in high-privilege WordPress user. CVSS 3.1 score is 6.1.
Likely exposure
Exposure is limited to WordPress installations running WP Fastest Cache versions before 0.9.5, especially where administrators remain logged in while browsing external content.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. WPScan is tagged with exploit-related material, so assume public technical details may exist, but active exploitation is not established here.
Researcher notes
Evidence supports CSRF leading to stored XSS through an AJAX settings action. The bundle does not provide affected CPEs, vendor attribution, active exploitation evidence, or detailed fixed-version lineage beyond before 0.9.5.
Mitigation direction
- Update WP Fastest Cache to version 0.9.5 or later.
- Check vendor and plugin repository guidance for current fixed versions.
- Restrict administrator browsing from logged-in WordPress sessions.
- Review plugin settings for unexpected CDN integration values.
- Remove stored script-like content from affected plugin options.
Validation and detection
- Inventory WordPress sites using WP Fastest Cache.
- Confirm installed plugin version is 0.9.5 or later.
- Review administrator accounts for recent suspicious setting changes.
- Inspect WP Fastest Cache CDN integration configuration.
- Check site pages for unexpected stored script execution indicators.
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 lookupCWE-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-2021-24870 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://wpscan.com/vulnerability/48de63ab-2ef1-4469-8fc4-9346068bdf06/CVE reference · exploit, vdb-entry
- https://jetpack.com/2021/10/14/multiple-vulnerabilities-in-wp-fastest-cache-plugin/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.