Is CVE-2026-116858 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-116858 being exploited in the wild.

How severe is CVE-2026-116858?

Medium severity, with a CVSS score of 4.3, published 3 November 2026.

Which products and versions are affected?

WPMU DEV Forminator through 1.58.3.

Is there a fix for CVE-2026-116858?

Yes: fixed in 1.58.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-116858 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-116858?

Check whether you run WPMU DEV Forminator at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-116858: WPMU DEV Forminator cross-site scripting in form content

CVE-2026-116858 · Severity: medium · CVSS 4.3 · Published 2026-11-03

Forminator is a WordPress plugin that allows users to create and manage forms on websites. The plugin contains a cross-site scripting (XSS) vulnerability that enables attackers with subscriber-level access to inject malicious scripts into form content, which are then executed when other users view the affected pages. An attacker could use this to steal credentials, deface website content, or distribute malware.

Technologies: WPMU DEV Forminator. Vendors: WPMU DEV.

Quick answers

Is CVE-2026-116858 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-116858 being exploited in the wild.
How severe is CVE-2026-116858?: Medium severity, with a CVSS score of 4.3, published 3 November 2026.
Which products and versions are affected?: WPMU DEV Forminator through 1.58.3.
Is there a fix for CVE-2026-116858?: Yes: fixed in 1.58.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-116858 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-116858?: Check whether you run WPMU DEV Forminator at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 1.58.4

Technical details

The vulnerability is an improper neutralization of HTML script tags in form pages, allowing content injection via a basic XSS flaw. Attack requires subscriber-level privileges to inject the malicious payload into form content. When authenticated as a subscriber, an attacker can inject script-related HTML tags that execute in the context of the page viewed by other users, leading to session hijacking, credential theft, or malware distribution.

Affected products

WPMU DEV Forminator through 1.58.3

Timeline

2026-10-19: disclosed
2026-11-03: advisory

References

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