CVE-2022-4830Public exploitNetwork attack vector

Stored XSS via unescaped shortcode class attribute

Published Feb 13, 2023 · Updated Oct 1, 2024

Stored XSS in Paid Memberships Pro before 2.9.9 allows remote authenticated users to execute script in administrators' browsers via a shortcode. The pmpro_checkout_button shortcode inserts its class attribute into button markup without attribute escaping, permitting quote breakout into an event handler. Contributor access is sufficient to save the shortcode in a post, but a higher-privileged user must view the page and hover over the button.

CVSS severity5.4
Medium
EPSS probability65.01%
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 Paid Memberships Pro before 2.9.9 allows remote authenticated users to execute script in administrators' browsers via a shortcode. The pmpro_checkout_button shortcode inserts its class attribute into button markup without attribute escaping, permitting quote breakout into an event handler. Contributor access is sufficient to save the shortcode in a post, but a higher-privileged user must view the page and hover over the button.

The record

CVE
CVE-2022-4830
Published
Feb 13, 2023
Updated
Oct 1, 2024
Vendor
Paid Memberships Pro
Product
Paid Memberships Pro
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 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=0 <2.9.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Paid Memberships Pro · Paid Memberships Proversion=0 <2.9.9

Published CVSS scores

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')
T1059.007Command and Scripting Interpreter: JavaScript/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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