Security readout for executives and security teams
Plain-English summary
Current Book, a WordPress plugin, allowed authenticated users to save Author or Book Title values that were later shown without proper safety checks. A malicious logged-in user could store script content that runs when another user views affected pages. The sources do not show active exploitation or a confirmed fixed version.
Executive priority
Treat this as a moderate WordPress application risk. It is not evidenced as actively exploited, but stored XSS can affect administrators and site visitors once malicious content is saved. Prioritize sites that allow multiple authenticated contributors or public account creation.
Technical view
CVE-2021-24538 is a CWE-79 authenticated stored XSS in Current Book through version 1.0.1. The issue is missing input sanitization on Author and Book Title values and missing output escaping when those values are rendered in the browser. Severity, CVSS, affected roles, and patch status are not supplied in the bundle.
Likely exposure
Exposure is limited to WordPress sites running Current Book version 1.0.1 or earlier. Risk is higher where untrusted or lower-privileged authenticated users can create or edit book metadata that other users, editors, or administrators later view.
Exploitation context
The provided sources describe the flaw as authenticated stored XSS. They do not cite exploitation in the wild, and the CVE is not marked in KEV. Exploitation would require a logged-in user able to add affected Author or Book Title content and a victim viewing the stored output.
Researcher notes
The evidence is concise and points to Author and Book Title fields. Missing details include CVSS, required WordPress role, proof of fix, and exploit observations. Validate against the installed plugin code and current WPScan/vendor guidance before assigning final remediation status.
Mitigation direction
- Inventory WordPress sites for Current Book version 1.0.1 or earlier.
- Check WPScan and vendor guidance for an updated or maintained replacement.
- Disable or remove the plugin if no safe maintained version is available.
- Restrict book metadata editing to trusted users until remediated.
- Review stored Author and Book Title values for unexpected script-like content.
Validation and detection
- Confirm whether Current Book is installed and record its version.
- Verify which authenticated roles can add or edit book metadata.
- Review affected rendering paths for proper sanitization and output escaping.
- Check plugin advisories for patch status before closing the finding.
- Inspect existing book metadata for suspicious embedded markup.
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-2021-24538 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/f9911a43-0f4c-403f-9fca-7822eb693317CVE 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.