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Fencer Intel
critical 9.8

CVE-2026-6443 json

Essentialplugin Plugins (Various Versions) - Injected Backdoor

published 6mo ago modified 16d ago also EUVD-2026-23384

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

All plugins by Essentialplugin for WordPress are vulnerable to an injected backdoor in various versions. This is due to the plugin being sold to a malicious threat actor that embedded a backdoor in all of the plugin's they acquired. This makes it possible for the threat actor to maintain a persistent backdoor and inject spam into the affected sites.

Is CVE-2026-6443 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
6mo ago

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
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

  • essentialplugin Accordion and Accordion Slider
  • essentialplugin Portfolio and Projects
  • essentialplugin Featured Post Creative
  • essentialplugin Post grid and filter ultimate
  • essentialplugin WP Featured Content and Slider
  • essentialplugin Post Ticker Ultimate
  • essentialplugin Trending/Popular Post Slider and Widget
  • essentialplugin Meta Slider and Carousel with Lightbox
  • essentialplugin Album and Image Gallery Plus Lightbox
  • essentialplugin Timeline and History slider
  • essentialplugin WP Blog and Widgets
  • essentialplugin Countdown Timer Ultimate
  • essentialplugin Blog Designer – Post and Widget
  • essentialplugin Team Slider and Team Grid Showcase plus Team Carousel
  • essentialplugin Video gallery and Player
  • essentialplugin Popup Maker and Popup Anything – Popup for opt-ins and Lead Generation Conversions
  • essentialplugin Testimonial Grid and Testimonial Slider plus Carousel with Rotator Widget
  • essentialplugin WP Responsive Recent Post Slider/Carousel
  • essentialplugin WP Slick Slider and Image Carousel
  • essentialplugin WP Logo Showcase Responsive Slider and Carousel
  • essentialplugin WP responsive FAQ with category plugin
  • essentialplugin WP News and Scrolling Widgets

Classification

Weakness
Technology feeds

References

Sources

Fencer Intel 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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.