CVE-2021-24716Public exploitNetwork attack vector

Stored script execution via unsanitized permalink slugs

Published Nov 1, 2021 · Updated Aug 3, 2024

Stored XSS in Webnus Modern Events Calendar Lite before 5.22.3 allows remote authenticated users to execute scripts via permalink settings. The Main Slug and Category Slug settings store markup without adequate sanitization or output escaping, then render it when the settings page reloads. Access to adjust wp-admin settings is required, and viewing the affected page executes the stored script in the viewer's browser.

CVSS severity5.4
Medium
EPSS probability0.65%
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 Webnus Modern Events Calendar Lite before 5.22.3 allows remote authenticated users to execute scripts via permalink settings. The Main Slug and Category Slug settings store markup without adequate sanitization or output escaping, then render it when the settings page reloads. Access to adjust wp-admin settings is required, and viewing the affected page executes the stored script in the viewer's browser.

The record

CVE
CVE-2021-24716
Published
Nov 1, 2021
Updated
Aug 3, 2024
Vendor
Webnus
Product
Modern Events Calendar Lite
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 1, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5.22.3 <5.22.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Webnus · Modern Events Calendar Liteversion=5.22.3 <5.22.3

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
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/JScript

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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