# CVE-2026-107864: Igor Funa Ad Inserter stored cross-site scripting

Source: https://junglewise.ai/threats/cve-2026-107864-improper-neutralization-of-input-during-web-page-generation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-12. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-107864 · Severity: medium · CVSS 6.5 · Published 2026-10-12

Ad Inserter is a WordPress plugin that allows administrators to insert advertisements into website content. A stored cross-site scripting (XSS) vulnerability in versions up to 2.8.18 allows attackers with contributor or higher privileges to inject malicious scripts that execute in visitors' browsers, potentially stealing their data or hijacking their accounts.

Technologies: [Igor Funa Ad Inserter](https://junglewise.ai/threats/technologies/ad-inserter). Vendors: [Igor Funa](https://junglewise.ai/threats/vendors/igor-funa).

## Quick answers

**Is CVE-2026-107864 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-107864 being exploited in the wild.

**How severe is CVE-2026-107864?** Medium severity, with a CVSS score of 6.5, published 12 October 2026.

**Which products and versions are affected?** Igor Funa Ad Inserter through 2.8.18.

**Is there a fix for CVE-2026-107864?** Yes: fixed in 2.8.19. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-107864 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-107864?** Check whether you run Igor Funa Ad Inserter 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 2.8.19

## Technical details

The plugin improperly neutralizes user input when generating web page content, enabling stored XSS injection by authenticated users with contributor-level or higher privileges. Exploitation requires user interaction (e.g., an administrator or editor visiting a page with injected content), but once stored, the payload affects all site visitors. The vulnerability is fixed in version 2.8.19.

## Affected products

- Igor Funa Ad Inserter through 2.8.18

## Timeline

- 2026-10-12: disclosed
- 2026-10-12: patched

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/wordpress/plugin/ad-inserter/vulnerability/wordpress-ad-inserter-plugin-2-8-18-cross-site-scripting-xss-vulnerability-2?_s_id=cve](https://patchstack.com/database/wordpress/plugin/ad-inserter/vulnerability/wordpress-ad-inserter-plugin-2-8-18-cross-site-scripting-xss-vulnerability-2?_s_id=cve)

## Related threats

- [Igor Funa Ad Inserter XSS in content injection](https://junglewise.ai/threats/cve-2026-124262-improper-neutralization-of-script-related-html-tags-in-a-web)
- [Ad Inserter cross-site scripting in plugin](https://junglewise.ai/threats/cve-2026-105077-unauthenticated-cross-site-scripting-xss-in-ad-inserter-2-8-19)
- [Igor Funa Ad Inserter stored cross-site scripting](https://junglewise.ai/threats/cve-2026-118094-improper-neutralization-of-input-during-web-page-generation)
- [Igor Funa Ad Inserter reflected cross-site scripting](https://junglewise.ai/threats/cve-2026-114709-improper-neutralization-of-input-during-web-page-generation)
- [Igor Funa Ad Inserter reflected XSS in plugin settings](https://junglewise.ai/threats/cve-2026-114194-improper-neutralization-of-input-during-web-page-generation)