CVE-2021-24660Public exploitNetwork attack vector

Stored XSS via unescaped shortcode identifier

Published Sep 27, 2021 · Updated Aug 3, 2024

Stored cross-site scripting in WPXPO PostX before 2.4.10 allows remote authenticated users to execute script through a shortcode. The Saved Templates shortcode renders its id value as an HTML attribute without neutralizing injected attributes, allowing an event handler to be stored. Contributor access and the Saved Templates Addon are required, and the script executes in another user's browser when the stored page is viewed.

CVSS severity5.4
Medium
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in WPXPO PostX before 2.4.10 allows remote authenticated users to execute script through a shortcode. The Saved Templates shortcode renders its id value as an HTML attribute without neutralizing injected attributes, allowing an event handler to be stored. Contributor access and the Saved Templates Addon are required, and the script executes in another user's browser when the stored page is viewed.

The record

CVE
CVE-2021-24660
Published
Sep 27, 2021
Updated
Aug 3, 2024
Vendor
WPXPO
Product
PostX
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 27, 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=2.4.10 <2.4.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WPXPO · PostXversion=2.4.10 <2.4.10

Published CVSS scores

5.4WordfenceCVSS: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')
T1203Exploitation for Client Execution

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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