CVE-2021-33852Public exploitNetwork attack vector

Stored XSS via unencoded Duplicate Title output

Published Mar 9, 2022 · Updated Aug 4, 2024

Stored XSS in Metaphor Creations Post Duplicator 2.23 allows remote authenticated users to run JavaScript in another user's browser. The Duplicate Title setting stores attacker-controlled markup and later renders it without context-sensitive output encoding. The payload runs when another user opens the settings page or application root after post duplication, exposing browser-session data and page integrity.

CVSS severity5.4
Medium
EPSS probability0.64%
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 Metaphor Creations Post Duplicator 2.23 allows remote authenticated users to run JavaScript in another user's browser. The Duplicate Title setting stores attacker-controlled markup and later renders it without context-sensitive output encoding. The payload runs when another user opens the settings page or application root after post duplication, exposing browser-session data and page integrity.

The record

CVE
CVE-2021-33852
Published
Mar 9, 2022
Updated
Aug 4, 2024
Vendor
Metaphor Creations
Product
Post Duplicator
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 9, 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

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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=Version 2.23

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Metaphor Creations · Post Duplicatorversion=Version 2.23

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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
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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