Is Nelio A/B Testing safe to use?

Laskyr does not give safety verdicts. No known unpatched vulnerabilities in the latest version (8.5.7). As of 2026-11-04. 8 issues are on record for older versions; version 8.3.0 or newer fixes all of them that state a fix. Keep Nelio A/B Testing on the latest version (8.5.7) and remove it if you do not use it.

Which versions of Nelio A/B Testing are vulnerable?

Known issues on record (newest first): Missing authorization check (8.2.8 and older, fixed in 8.3.0); Remote code execution (8.2.7 and older, fixed in 8.2.8); SQL injection (8.2.4 and older, fixed in 8.2.5); Remote code execution (8.1.8 and older, fixed in 8.2.0); Path traversal / file read (older than 4.5.0, fixed in 4.5.0); Server-side request forgery (SSRF) (older than 4.5.9, fixed in 4.5.9). The full list with sources is on this page.

What is the latest version of Nelio A/B Testing?

8.5.7, according to wordpress.org (last updated 2026-10-26). It has 4,000+ active installs.

What should I do if my Nelio A/B Testing is out of date?

Take a backup, then update it from Dashboard > Updates (or run wp plugin update nelio-ab-testing). If you cannot update right away, deactivate it until you can. If you think the site was already attacked, run a free scan at https://laskyr.com/scan.

Plugins · nelio-ab-testing · data as of 2026-11-04

Is Nelio A/B Testing safe? Known vulnerabilities and latest version

Latest version: 8.5.7
Last updated: 2026-10-26
Active installs: 4,000+
Known issues on record: 8
Unpatched in latest: 0
Tested up to WP: 7.1.4 · PHP 7.4+

Run A/B tests and heatmaps in WordPress. Optimize pages and WooCommerce products, track conversions, and start free with 500 tested views/month. — by Nelio Software

What to do

Update to the latest version (8.5.7). Anything older than 8.3.0 has at least one known issue listed below. Dashboard → Updates, or Plugins → “update now”.
If you cannot update right away, deactivate it until you can.
Turn on auto-updates for it: Plugins → “Enable auto-updates” on its row.
If you ran a vulnerable version and something looks off (spam pages, strange admins, redirects), run the free scan.

With WP-CLI: wp plugin get nelio-ab-testing --field=version shows what you run; wp plugin update nelio-ab-testing updates it.

Check your version

Known vulnerabilities

8 on record, newest first. “Affected” is the version range the source gives; “fixed in” is the version the source names, or (marked *) the first wordpress.org release after the last affected version.

medium 5.3 CVE-2026-40742 · published 2026-04-15

Missing authorization check in Nelio A/B Testing (8.2.8 and older)

Affected: 8.2.8 and older
Fixed in: 8.3.0
Access needed (per CVSS): No login needed
Range from: CVE record (the advisory publisher) · score by Patchstack

Details from the advisory

Missing Authorization vulnerability in Nelio Software Nelio AB Testing nelio-ab-testing allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Nelio AB Testing: from n/a through <= 8.2.8.

NVD CVE-2026-40742 Patchstack advisory

critical 9.1 CVE-2026-32573 · published 2026-03-25

Remote code execution in Nelio A/B Testing (8.2.7 and older)

Affected: 8.2.7 and older
Fixed in: 8.2.8
Access needed (per CVSS): Needs an admin-level account
Range from: advisory text · score by Patchstack

Details from the advisory

Improper Control of Generation of Code ('Code Injection') vulnerability in Nelio Software Nelio AB Testing nelio-ab-testing allows Code Injection.This issue affects Nelio AB Testing: from n/a through <= 8.2.7.

NVD CVE-2026-32573 Patchstack advisory

high 7.6 CVE-2026-25378 · published 2026-02-19

SQL injection in Nelio A/B Testing (8.2.4 and older)

Affected: 8.2.4 and older
Fixed in: 8.2.5
Access needed (per CVSS): Needs an admin-level account
Range from: CVE record (the advisory publisher) · score by Patchstack

Details from the advisory

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in Nelio Software Nelio AB Testing nelio-ab-testing allows Blind SQL Injection.This issue affects Nelio AB Testing: from n/a through <= 8.2.4.

NVD CVE-2026-25378 Patchstack advisory

critical 9.1 CVE-2025-67944 · published 2026-01-22

Remote code execution in Nelio A/B Testing (8.1.8 and older)

Affected: 8.1.8 and older
Fixed in: 8.2.0
Access needed (per CVSS): Needs an admin-level account
Range from: CVE record (the advisory publisher) · score by Patchstack

Details from the advisory

NVD CVE-2025-67944 Patchstack advisory

medium 6.5 CVE-2016-10977 · published 2019-09-17

Path traversal / file read in Nelio A/B Testing (older than 4.5.0)

Affected: older than 4.5.0
Fixed in: 4.5.0
Access needed (per CVSS): Needs a low-level account (e.g. subscriber)
Range from: NVD analysis · score by NVD

Details from the advisory

The nelio-ab-testing plugin before 4.5.0 for WordPress has filename=..%2f directory traversal.

NVD CVE-2016-10977 wordpress.org wpvulndb.com openwall.com

critical 10.0 CVE-2016-10926 · published 2019-08-22

Server-side request forgery (SSRF) in Nelio A/B Testing (older than 4.5.9)

Affected: older than 4.5.9
Fixed in: 4.5.9
Access needed (per CVSS): No login needed
Range from: NVD analysis · score by NVD

Details from the advisory

The nelio-ab-testing plugin before 4.5.9 for WordPress has SSRF in ajax/iesupport.php.

NVD CVE-2016-10926 wordpress.org

critical 10.0 CVE-2016-10927 · published 2019-08-22

Server-side request forgery (SSRF) in Nelio A/B Testing (older than 4.5.11)

Affected: older than 4.5.11
Fixed in: 4.5.11
Access needed (per CVSS): No login needed
Range from: NVD analysis · score by NVD

Details from the advisory

The nelio-ab-testing plugin before 4.5.11 for WordPress has SSRF in ajax/iesupport.php.

NVD CVE-2016-10927 wordpress.org

high 8.8 CVE-2017-18547 · published 2019-08-16

Cross-site request forgery (CSRF) in Nelio A/B Testing (older than 4.6.4)

Affected: older than 4.6.4
Fixed in: 4.6.4
Access needed (per CVSS): No login needed; someone on the site has to click a link or open a page
Range from: NVD analysis · score by NVD

Details from the advisory

The nelio-ab-testing plugin before 4.6.4 for WordPress has CSRF in experiment forms.

NVD CVE-2017-18547 wordpress.org

Recent activity

2026-10-26 — latest release on wordpress.org (8.5.7).
2026-04-15 — Missing authorization check disclosed (CVE-2026-40742), fixed in 8.3.0.
2026-03-25 — Remote code execution disclosed (CVE-2026-32573), fixed in 8.2.8.
2026-02-19 — SQL injection disclosed (CVE-2026-25378), fixed in 8.2.5.

Free. We check the CVE feeds every day and email you only when a new issue for Nelio A/B Testing (nelio-ab-testing) is published or a fix ships. Unsubscribe in one click.

Browse vulnerabilities

Types found in this plugin: Remote code execution (2) · Server-side request forgery (SSRF) (2) · Missing authorization (1) · SQL injection (1) · Path traversal and file read (1) · Cross-site request forgery (CSRF) (1)

Where this data comes from

Version, last update, installs: wordpress.org/plugins/nelio-ab-testing (Plugins API), fetched 2026-11-04.
Vulnerabilities: NIST National Vulnerability Database (NVD), checked 2026-11-04. This product uses data from the NVD API but is not endorsed or certified by the NVD.
Each record links to its CVE page and to the original advisory (Wordfence, Patchstack or WPScan) where there is one. We only list a CVE here when its references or its advisory name this exact plugin, so a few real issues may be missing; none should be about a different plugin. Spot an error? Email Daniel.

Badge for your site or docs (states facts with a date, not a verdict):

<a href="https://laskyr.com/plugins/nelio-ab-testing"><img src="https://laskyr.com/plugins/nelio-ab-testing/badge.svg" alt="Nelio A/B Testing vulnerability status"></a>

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Is Nelio A/B Testing safe? Known vulnerabilities and latest version

No known unpatched vulnerabilities in the latest version (8.5.7)

What to do

Check your version

Known vulnerabilities

Missing authorization check in Nelio A/B Testing (8.2.8 and older)

Remote code execution in Nelio A/B Testing (8.2.7 and older)

SQL injection in Nelio A/B Testing (8.2.4 and older)

Remote code execution in Nelio A/B Testing (8.1.8 and older)

Path traversal / file read in Nelio A/B Testing (older than 4.5.0)

Server-side request forgery (SSRF) in Nelio A/B Testing (older than 4.5.9)

Server-side request forgery (SSRF) in Nelio A/B Testing (older than 4.5.11)

Cross-site request forgery (CSRF) in Nelio A/B Testing (older than 4.6.4)

Recent activity

Get an email when Nelio A/B Testing has a new vulnerability

Browse vulnerabilities

Where this data comes from