CVE-2023-39676Public exploitNetwork attack vector

Browser script execution via unsanitized JSONP callback

Published Sep 8, 2023 · Updated Sep 26, 2024

Reflected XSS in FieldThemes FieldPopupNewsletter 1.0.0 allows remote attackers to execute browser scripts via a crafted callback URL. The newsletterRegistration function in ajax.php concatenates the unsanitized callback query value into a JSONP-style response when the email input is absent or invalid. Exploitation requires a victim to follow the crafted URL, after which the script runs in the storefront origin and can read or alter data available to that browser session.

CVSS severity6.1
Medium
EPSS probability1.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in FieldThemes FieldPopupNewsletter 1.0.0 allows remote attackers to execute browser scripts via a crafted callback URL. The newsletterRegistration function in ajax.php concatenates the unsanitized callback query value into a JSONP-style response when the email input is absent or invalid. Exploitation requires a victim to follow the crafted URL, after which the script runs in the storefront origin and can read or alter data available to that browser session.

The record

CVE
CVE-2023-39676
Published
Sep 8, 2023
Updated
Sep 26, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 26, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1NIST NVDCVSS: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')
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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