CVE-2021-44082Public exploitNetwork attack vector

Remote code execution via article-preview XSS

Published Mar 29, 2022 · Updated Aug 4, 2024

Cross-site scripting in Textpattern 4.8.7 allows remote attackers to execute code through a crafted article-preview link. The preview handler accepts the Body parameter from a GET URL and renders its HTML without neutralization, allowing injected JavaScript to read the session's static CSRF token and upload a PHP webshell. Exploitation requires an authenticated victim with plugin-upload privileges to follow the link; the resulting webshell executes operating-system commands on the server.

CVSS severity8.3
High
EPSS probability3.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Textpattern 4.8.7 allows remote attackers to execute code through a crafted article-preview link. The preview handler accepts the Body parameter from a GET URL and renders its HTML without neutralization, allowing injected JavaScript to read the session's static CSRF token and upload a PHP webshell. Exploitation requires an authenticated victim with plugin-upload privileges to follow the link; the resulting webshell executes operating-system commands on the server.

The record

CVE
CVE-2021-44082
Published
Mar 29, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1505.003, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 29, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.3NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
9.6Pentest LimitedCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
5.1NIST NVDAV:N/AC:H/Au:N/C:P/I:P/A:P

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1505.003Web Shell
T1566.002Spearphishing 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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