CVE-2021-24619Public exploitNetwork attack vector

Stored XSS via unsanitized HTML setting

Published Sep 13, 2021 · Updated Aug 3, 2024

Stored XSS in Evona Per Page Add to Head 1.4.4 and earlier allows remote authenticated users to inject script through its HTML setting. The plugin stores the setting without neutralizing malicious HTML and emits it into page headers, where a frontend visit executes embedded event handlers. High-privilege access is required even when unfiltered_html is denied, and execution requires a user to visit an affected frontend page.

CVSS severity4.8
Medium
EPSS probability0.62%
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 Evona Per Page Add to Head 1.4.4 and earlier allows remote authenticated users to inject script through its HTML setting. The plugin stores the setting without neutralizing malicious HTML and emits it into page headers, where a frontend visit executes embedded event handlers. High-privilege access is required even when unfiltered_html is denied, and execution requires a user to visit an affected frontend page.

The record

CVE
CVE-2021-24619
Published
Sep 13, 2021
Updated
Aug 3, 2024
Vendor
Evona
Product
Per Page Add to Head
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 13, 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=1.4.4 <=1.4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Evona · Per Page Add to Headversion=1.4.4 <=1.4.4

Published CVSS scores

4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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')
T1059.007JavaScript/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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