CVE-2021-24850Public exploitNetwork attack vector

Stored XSS via unfiltered custom-field shortcode output

Published Nov 17, 2021 · Updated Aug 3, 2024

Stored XSS in Paul Ryan Insert Pages before 3.7.0 allows remote authenticated users to execute script via embedded custom fields. The display=all shortcode renders another post's custom-field values without filtering them through wp_kses_post(), so attacker-supplied markup reaches the page output. Contributor access is sufficient to store the payload, and execution requires a reader to view content that embeds the poisoned post.

CVSS severity5.4
Medium
EPSS probability0.62%
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 Paul Ryan Insert Pages before 3.7.0 allows remote authenticated users to execute script via embedded custom fields. The display=all shortcode renders another post's custom-field values without filtering them through wp_kses_post(), so attacker-supplied markup reaches the page output. Contributor access is sufficient to store the payload, and execution requires a reader to view content that embeds the poisoned post.

The record

CVE
CVE-2021-24850
Published
Nov 17, 2021
Updated
Aug 3, 2024
Vendor
Paul Ryan
Product
Insert Pages
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 17, 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=3.7.0 <3.7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Paul Ryan · Insert Pagesversion=3.7.0 <3.7.0

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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