# CVE-2026-110903: StellarWP The Events Calendar stored cross-site scripting

Source: https://junglewise.ai/threats/cve-2026-110903-improper-neutralization-of-input-during-web-page-generation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-16. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-110903 · Severity: medium · CVSS 6.5 · Published 2026-10-16

The Events Calendar is a WordPress plugin that helps website owners manage events and display calendars. A stored cross-site scripting (XSS) vulnerability allows contributors or developers to inject malicious scripts that execute when visitors view pages, potentially stealing personal data or hijacking user accounts. Attackers need to have contributor-level access or trick a privileged user into clicking a malicious link or form.

Technologies: [StellarWP The Events Calendar](https://junglewise.ai/threats/technologies/the-events-calendar). Vendors: [StellarWP](https://junglewise.ai/threats/vendors/stellarwp).

## Quick answers

**Is CVE-2026-110903 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-110903 being exploited in the wild.

**How severe is CVE-2026-110903?** Medium severity, with a CVSS score of 6.5, published 16 October 2026.

**Which products and versions are affected?** StellarWP The Events Calendar through 6.18.1.

**Is there a fix for CVE-2026-110903?** Yes: fixed in 6.18.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-110903 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-110903?** Check whether you run StellarWP The Events Calendar 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 6.18.2

## Technical details

A stored XSS vulnerability in The Events Calendar plugin through version 6.18.1 allows contributors with minimal privileges to inject persistent malicious scripts through improper input neutralization during web page generation. The vulnerability requires user interaction—a privileged user must perform an action like clicking a malicious link—but once executed, the injected script persists and runs for all site visitors. The vulnerability is fixed in version 6.18.2.

## Affected products

- StellarWP The Events Calendar through 6.18.1

## Timeline

- 2026-10-08: disclosed: Reported to Patchstack
- 2026-10-16: advisory: Published by Patchstack

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/wordpress/plugin/the-events-calendar/vulnerability/wordpress-the-events-calendar-plugin-6-18-1-cross-site-scripting-xss-vulnerability?_s_id=cve](https://patchstack.com/database/wordpress/plugin/the-events-calendar/vulnerability/wordpress-the-events-calendar-plugin-6-18-1-cross-site-scripting-xss-vulnerability?_s_id=cve)

## Related threats

- [StellarWP The Events Calendar cross-site scripting in content](https://junglewise.ai/threats/cve-2026-123469-improper-neutralization-of-script-related-html-tags-in-a-web)
- [StellarWP The Events Calendar stored cross-site scripting](https://junglewise.ai/threats/cve-2026-123464-improper-neutralization-of-input-during-web-page-generation)
- [StellarWP The Events Calendar broken access control](https://junglewise.ai/threats/cve-2026-119367-missing-authorization-vulnerability-in-liquid-web-stellarwp-the)
- [StellarWP The Events Calendar stored XSS in plugin](https://junglewise.ai/threats/cve-2026-119369-improper-neutralization-of-input-during-web-page-generation)
- [StellarWP The Events Calendar stored cross-site scripting](https://junglewise.ai/threats/cve-2026-119370-improper-neutralization-of-input-during-web-page-generation)