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Fencer Vulns
medium 6.1

CVE-2023-6000 json

Popup Builder < 4.2.3 - Unauthenticated Stored XSS

published 2024-01-01 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-58267

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.0%
EPSS 2.0% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known, plus a Nuclei check

Summary

The Popup Builder WordPress plugin before 4.2.3 does not prevent simple visitors from updating existing popups, and injecting raw JavaScript in them, which could lead to Stored XSS attacks.

Patch / fix

  • Unknown Popup Builder 4.2.3

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

2.00% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template WordPress Popup Builder <= 4.2.3 - Unauthenticated Stored XSS nuclei detection template
  • wpscan.com https://wpscan.com/vulnerability/cdb3a8bd-4ee0-4ce0-9029-0490273bcfc8 referenced PoC, tagged "exploit" by a source, unverified
  • wpscan.com https://wpscan.com/blog/stored-xss-fixed-in-popup-builder-4-2-3/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

  • Unknown Popup Builder

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.