WordPress plugin

User Blocker <= 1.5.5 — Authenticated (Admin+) CSV Injection

CVE-2022-45078Published Nov 9, 2022 · Updated Nov 13, 2026

Affected: ≤1.5.5Update to 1.5.6 or newer

All remediation steps

Watch plugin

Severity

Medium5.9

CVSS

5.9

CVSS 3.1 · CNA (Wordfence)

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

What does this vector mean?

AV:N Attack vector: Network
AC:L Attack complexity: Low
PR:H Privileges required: High
UI:R User interaction: Required
S:C Scope: Changed
C:L Confidentiality: Low
I:L Integrity: Low
A:L Availability: Low

Weakness

CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

Required access

Unknown

Exploit prediction (EPSS)

No score

CISA KEV

Not listed

On this page7

Am I affected?

User Blocker user-blocker

Affected≤ 1.5.5
Patched in1.5.6

You are affected if you run ≤ 1.5.5. Version 1.5.6 and later are not affected by this issue.

Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under User Blocker.
No admin access? Run a passive check of your site. It reads public files only.

What to do

Update to version 1.5.6, or a newer patched version
Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
Watch User Blocker to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Kévin Mosbahi (Mika).

The User Blocker plugin for WordPress is vulnerable to CSV Injection in versions up to, and including, 1.5.5. This allows administrator-level attackers to embed untrusted input into exported CSV files, which can result in code execution when these files are downloaded and opened on a local system with a vulnerable configuration.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

Advisorywordfence.com

Timeline

Nov 9, 2022
CVE published
Severity medium, CVSS 5.9
Nov 13, 2026
Record last updated

Sources & licenses

Wordfence record

Vulnerability data: Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
CVE® identifiers: [object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE: National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.

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