What is CVE-2025-54739?

CVE-2025-54739 is a medium-severity vulnerability in Posimyth Nexter Blocks, classified under Missing Authorization. CVSS score: 5.3/10. Published 2025-08-14.

How severe is CVE-2025-54739?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2025-54739 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Posimyth Nexter Blocks

CVE-2025-54739

Missing Authorization vulnerability in POSIMYTH Nexter Blocks the-plus-addons-for-block-editor allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Nexter Blocks: from n/a through <= 4.5.4.

Vulnerability class: Broken Access Control

EPSS: 0.001 (19.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Posimyth Nexter Blocks — versions 0

Weakness classification (CWE)

CWE-862 — Missing Authorization

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

patchstack.com/database/Wordpress/Plugin/the-plus-addons-for-block-editor/vulne… (vdb-entry)

Frequently asked questions

What is CVE-2025-54739?: CVE-2025-54739 is a medium-severity vulnerability in Posimyth Nexter Blocks, classified under Missing Authorization. CVSS score: 5.3/10. Published 2025-08-14.
How severe is CVE-2025-54739?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2025-54739 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.