CVE-2023-6000Public exploitNetwork attack vector

Unauthenticated stored XSS via unchecked preview handler

Published Jan 1, 2024 · Updated Jun 18, 2025

Stored XSS in Sygnoos Popup Builder before 4.2.3 allows remote attackers to inject scripts into existing popups via crafted POST data. A preview handler attached to WordPress init lacks capability checks, while inconsistent POST parsing lets sgpb-prefixed fields overwrite popup data. No account is required; the script runs when a visitor opens an affected page and can act with that visitor's WordPress privileges.

CVSS severity6.1
Medium
EPSS probability2.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Sygnoos Popup Builder before 4.2.3 allows remote attackers to inject scripts into existing popups via crafted POST data. A preview handler attached to WordPress init lacks capability checks, while inconsistent POST parsing lets sgpb-prefixed fields overwrite popup data. No account is required; the script runs when a visitor opens an affected page and can act with that visitor's WordPress privileges.

The record

CVE
CVE-2023-6000
Published
Jan 1, 2024
Updated
Jun 18, 2025
Vendor
Sygnoos
Product
Popup Builder
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <4.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sygnoos · Popup Builderversion=0 <4.2.3

Published CVSS scores

6.1NIST NVDCVSS: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')
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo