CVE-2026-17011

Nexter Blocks <= 5.0.1 - Payment Bypass to Authenticated (Contributor+) Stored CSS Injection

2026-08-03 00:00

Strategic Overview

Status: Patched in 5.0.2
Affected Plugin: Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder
Affected Version: <= 5.0.1
CVSS: 4.3Medium
Weakness type: CWE-345 · Insufficient Verification of Data Authenticity
CVE: CVE-2026-17011

View all Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder vulnerabilities

At a glance

CVE-2026-17011 is a medium-severity Insufficient Verification of Data Authenticity vulnerability in the Nexter Blocks WordPress plugin, affecting versions <= 5.0.1. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Contributor level or above. The issue is fixed in version 5.0.2; sites on affected versions should update now. Disclosed August 2026, reported by Vaibhav Narkhede.

Vulnerability Overview

The Nexter Blocks plugin for WordPress is vulnerable to Payment Bypass in versions up to, and including, 5.0.1. This is due to a lack of server-side payment verification. This makes it possible for authenticated attackers, with contributor-level access and above, to bypass payments.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.

CWE-345: Insufficient Verification of Data Authenticity

The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.

Remediation

Update to version 5.0.2, or a newer patched version

How does WordSec protect against this?

The fix is the thing that ends this: Nexter Blocks 5.0.2 closes this, and updating the plugin is the step that ends it.

Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-17011 https://www.wordfence.com/threat-intel/vulnerabilities/id/b258e85e-eb1d-441a-ab99-c9604fb53656 https://nvd.nist.gov/vuln/detail/CVE-2026-17011

Related records

Other vulnerabilities in Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder

CVSS Vector

4.3

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

This record contains material that is subject to copyright

CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

https://www.cve.org/Legal/TermsOfUse

Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.

https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/