CVE-2021-29009Public exploitNetwork attack vector

Authenticated script execution via unescaped type parameter

Published Mar 25, 2021 · Updated Aug 3, 2024

Reflected cross-site scripting in SEO Panel 4.8.0 allows remote authenticated users to execute JavaScript through archive.php. The page accepts a quote-breaking type value in an HTML attribute, allowing autofocus and onfocus markup to execute JavaScript in the browser. Administrator-panel authentication and a victim opening the crafted URL are required; successful exploitation can expose session cookies or redirect the victim.

CVSS severity4.8
Medium
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected cross-site scripting in SEO Panel 4.8.0 allows remote authenticated users to execute JavaScript through archive.php. The page accepts a quote-breaking type value in an HTML attribute, allowing autofocus and onfocus markup to execute JavaScript in the browser. Administrator-panel authentication and a victim opening the crafted URL are required; successful exploitation can expose session cookies or redirect the victim.

The record

CVE
CVE-2021-29009
Published
Mar 25, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 25, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

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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