Nexter Blocks <= 5.0.0 - Authenticated (Subscriber+) Path Traversal to Arbitrary CSS/JS File Deletion via 'plus_name' Parameter
Summary
| CVE | CVE-2026-15420 |
|---|---|
| State | PUBLISHED |
| Assigner | Wordfence |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-24 04:16:51 UTC |
| Updated | 2026-07-24 23:16:49 UTC |
| Description | The Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 5.0.0 via the 'plus_name' parameter. This makes it possible for authenticated attackers, with subscriber-level access and above, to delete arbitrary JS/CSS files on the server, which can lead to denial of service or destruction of critical plugin and theme assets. |
Risk And Classification
Primary CVSS: v3.1 4.3 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Problem Types: CWE-22 | CWE-22 CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 4.3 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
| 3.1 | CNA | DECLARED | 4.3 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
LowAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Posimyththemes | Nexter Blocks Gutenberg Blocks Page Builder AI Website Builder | affected 5.0.0 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| www.wordfence.com/threat-intel/vulnerabilities/id/85550779-fd46-4130-92f1-b291d... | [email protected] | www.wordfence.com | |
| plugins.trac.wordpress.org/changeset | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/the-plus-addons-for-block-editor/tags/4.7.17/classes/... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/the-plus-addons-for-block-editor/tags/4.7.17/classes/... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/the-plus-addons-for-block-editor/tags/4.7.17/classes/... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/the-plus-addons-for-block-editor/tags/4.7.14/classes/... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/the-plus-addons-for-block-editor/tags/4.7.14/classes/... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/the-plus-addons-for-block-editor/tags/4.7.14/classes/... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/the-plus-addons-for-block-editor/tags/4.7.14/classes/... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/the-plus-addons-for-block-editor/tags/4.7.17/classes/... | [email protected] | plugins.trac.wordpress.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Wordfence PRISM (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-07-10T15:15:51.000Z | Vendor Notified |
| CNA | 2026-07-23T14:21:30.000Z | Disclosed |
There are currently no legacy QID mappings associated with this CVE.