CVE-2021-24659Public exploitNetwork attack vector

Contributor-level stored XSS via crafted block attributes

Published Sep 27, 2021 · Updated Aug 3, 2024

Stored XSS in WPXPO PostX before 2.4.10 allows remote authenticated users to execute JavaScript through crafted block markup. The published proof of concept places JavaScript URLs and event handlers in headingURL and advanceId attributes, which persist and execute when rendered. Contributor access is sufficient to save the payload, and execution requires another user to view the affected content.

CVSS severityUnavailable
Unscored
EPSS probability0.55%
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 WPXPO PostX before 2.4.10 allows remote authenticated users to execute JavaScript through crafted block markup. The published proof of concept places JavaScript URLs and event handlers in headingURL and advanceId attributes, which persist and execute when rendered. Contributor access is sufficient to save the payload, and execution requires another user to view the affected content.

The record

CVE
CVE-2021-24659
Published
Sep 27, 2021
Updated
Aug 3, 2024
Vendor
WPXPO
Product
PostX
Classifications
CWE-79, T1059.007
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

No CVSS assessment is available in this record.

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-79Cross-site Scripting (XSS)
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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