CVE-2023-0733Public exploitNetwork attack vector

Unauthenticated stored XSS via unescaped newsletter data

Published May 30, 2023 · Updated Jan 10, 2025

Stored XSS in Newsletter Popup 1.2 and earlier allows remote attackers to inject script code through an unauthenticated AJAX request. The savenewsletter AJAX action accepts the nldata EMAIL field without sanitizing it, stores the value, and renders it unescaped in the Local Record view. An administrator must open Show Record in the WordPress dashboard to execute the stored script, enabling code to run in that administrator's browser context.

CVSS severity6.1
Medium
EPSS probability0.51%
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 Newsletter Popup 1.2 and earlier allows remote attackers to inject script code through an unauthenticated AJAX request. The savenewsletter AJAX action accepts the nldata EMAIL field without sanitizing it, stores the value, and renders it unescaped in the Local Record view. An administrator must open Show Record in the WordPress dashboard to execute the stored script, enabling code to run in that administrator's browser context.

The record

CVE
CVE-2023-0733
Published
May 30, 2023
Updated
Jan 10, 2025
Vendor
mndpsingh287
Product
Newsletter Popup
Classifications
CWE-79
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 10, 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 <=1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

mndpsingh287 · Newsletter Popupversion=0 <=1.2

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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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