CVE-2021-24518Public exploitNetwork attack vector

Admin-level browser script execution via unescaped CSS

Published Aug 16, 2021 · Updated Aug 3, 2024

Stored XSS in Syam Mohan WPFront Notification Bar before 2.0.0.07176 allows remote authenticated users to execute script in visitors' browsers. The Custom CSS option stores input without sanitizing or escaping it, allowing a crafted closing style tag to inject a script element into rendered pages. Administrator-level access to the WordPress settings page is required, and execution occurs when a visitor loads a page containing the notification bar.

CVSS severity4.8
Medium
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Syam Mohan WPFront Notification Bar before 2.0.0.07176 allows remote authenticated users to execute script in visitors' browsers. The Custom CSS option stores input without sanitizing or escaping it, allowing a crafted closing style tag to inject a script element into rendered pages. Administrator-level access to the WordPress settings page is required, and execution occurs when a visitor loads a page containing the notification bar.

The record

CVE
CVE-2021-24518
Published
Aug 16, 2021
Updated
Aug 3, 2024
Vendor
Syam Mohan
Product
WPFront Notification Bar
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.0.0.07176 <2.0.0.07176

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Syam Mohan · WPFront Notification Barversion=2.0.0.07176 <2.0.0.07176

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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