Is CVE-2026-109989 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-109989 being exploited in the wild.

How severe is CVE-2026-109989?

Medium severity, with a CVSS score of 6.4, published 17 October 2026.

Which products and versions are affected?

Themify Popup up to and including 1.4.7.

Is there a fix for CVE-2026-109989?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-109989 attacked?

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

Am I affected by CVE-2026-109989?

Check whether you run Themify Popup 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-2026-109989: Themify Popup plugin for WordPress stored XSS in popup_width_unit parameter

CVE-2026-109989 · Severity: medium · CVSS 6.4 · Published 2026-10-17

The Themify Popup plugin for WordPress allows authenticated attackers with author-level access or higher to inject malicious scripts into pages through the 'popup_width_unit' parameter. When other users view the affected pages, the injected scripts execute in their browsers, potentially allowing attackers to steal credentials, deface content, or perform actions on behalf of legitimate users.

Vendors: Themify.

Quick answers

Is CVE-2026-109989 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-109989 being exploited in the wild.
How severe is CVE-2026-109989?: Medium severity, with a CVSS score of 6.4, published 17 October 2026.
Which products and versions are affected?: Themify Popup up to and including 1.4.7.
Is there a fix for CVE-2026-109989?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-109989 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-109989?: Check whether you run Themify Popup 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.

Technical details

The vulnerability is a stored cross-site scripting (XSS) flaw caused by insufficient input sanitization and output escaping of the 'popup_width_unit' parameter in the Themify Popup plugin. An authenticated attacker with author-level or higher privileges can inject arbitrary JavaScript that persists in the database and executes whenever any user accesses the injected page. No public exploit code has been reported in the wild.

Affected products

Themify Popup up to and including 1.4.7

Timeline

2026-10-17: disclosed

References

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