Security readout for executives and security teams
Plain-English summary
WPFront Notification Bar for WordPress had a stored cross-site scripting issue in versions before 2.0.0.07176. A privileged user could place script content in the plugin's Custom CSS setting, even where WordPress intended to block unfiltered HTML. This is mainly a governance and admin-compromise risk, not an unauthenticated mass-entry issue.
Executive priority
Treat as a targeted cleanup item, not an emergency unless untrusted administrators exist or an admin account may be compromised. Prioritize affected public WordPress sites and environments with delegated site-admin access.
Technical view
The reported weakness is CWE-79: missing sanitization or escaping of the Custom CSS setting. The source states high-privilege authenticated users, such as admins, could persist XSS payloads despite unfiltered_html being disallowed. No CVSS vector is supplied in the bundle, and affected-version metadata is incomplete or ambiguous beyond the stated before-2.0.0.07176 wording.
Likely exposure
Exposure is likely limited to WordPress sites running WPFront Notification Bar before 2.0.0.07176, especially where delegated administrators can edit plugin settings. The bundle does not support unauthenticated exposure or broad remote exploitation.
Exploitation context
The bundle describes authenticated stored XSS requiring high privilege access to plugin settings. It is not listed as KEV, and no provided source states active exploitation. Public advisories exist, including WPScan and Packet Storm references, but this response does not rely on exploit steps.
Researcher notes
Key evidence comes from the CVE description and WPScan-style advisory wording. The affected field in the bundle lists 2.0.0.07176 while the narrative says before 2.0.0.07176, so validate against vendor or WPScan records before enforcement decisions.
Mitigation direction
- Inventory WordPress sites for WPFront Notification Bar installations.
- Upgrade versions before 2.0.0.07176 following vendor guidance.
- Restrict plugin settings access to trusted administrators only.
- Review Custom CSS settings for unexpected script-like content.
- If upgrading is blocked, consider disabling the plugin until resolved.
Validation and detection
- Confirm installed WPFront Notification Bar version on each WordPress site.
- Verify no site runs a version before 2.0.0.07176.
- Inspect plugin Custom CSS configuration for suspicious stored content.
- Review administrator accounts with access to plugin settings.
- Check WordPress audit logs for recent plugin-setting changes.
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-2021-24518 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/53103cdc-a4bf-40fa-aeb1-790fc7a65f0aCVE reference · x_refsource_MISC
- https://packetstormsecurity.com/files/163472/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.