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Fencer Vulns
critical 9.8

CVE-2023-6623 in the critical feed json

Essential Blocks < 4.4.3 - Unauthenticated Local File Inclusion

published 2024-01-15 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-58846

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
50.7%
EPSS 50.7% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known, plus a Nuclei check

Summary

The Essential Blocks WordPress plugin before 4.4.3 does not prevent unauthenticated attackers from overwriting local variables when rendering templates over the REST API, which may lead to Local File Inclusion attacks.

Patch / fix

  • Unknown Essential Blocks 4.4.3

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
23 mo ago

Exploit prediction

50.67% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template Essential Blocks < 4.4.3 - Local File Inclusion nuclei detection template
  • wpscan.com https://wpscan.com/vulnerability/633c28e0-0c9e-4e68-9424-55c32789b41f referenced PoC, tagged "exploit" by a source, unverified
  • wpscan.com https://wpscan.com/blog/file-inclusion-vulnerability-fixed-in-essential-blocks-4-4-3/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Unknown Essential Blocks

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory
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.