CVE-2023-5237Public exploitNetwork attack vector

Contributor-level stored XSS via unescaped shortcode attribute

Published Oct 31, 2023 · Updated Apr 22, 2025

Stored XSS in Paid Memberships Pro Memberlite Shortcodes before 1.3.9 allows remote authenticated users to inject browser scripts. The memberlite_banner shortcode places its align attribute into generated HTML without validating or escaping attacker-controlled attribute text. Contributor access is required to save the crafted post, and script execution occurs when another user, including an administrator, views it.

CVSS severity5.4
Medium
EPSS probability0.45%
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 Memberlite Shortcodes before 1.3.9 allows remote authenticated users to inject browser scripts. The memberlite_banner shortcode places its align attribute into generated HTML without validating or escaping attacker-controlled attribute text. Contributor access is required to save the crafted post, and script execution occurs when another user, including an administrator, views it.

The record

CVE
CVE-2023-5237
Published
Oct 31, 2023
Updated
Apr 22, 2025
Vendor
Paid Memberships Pro
Product
Memberlite Shortcodes
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 31, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2025Record 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 <1.3.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Paid Memberships Pro · Memberlite Shortcodesversion=0 <1.3.9

Published CVSS scores

5.4WPScanCVSS: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.

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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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