# CVE-2026-27398: WP Chill RSVP and Event Management missing authorization

Source: https://junglewise.ai/threats/cve-2026-27398-wp-chill-rsvp-and-event-management-missing-authorization  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-25. Updated: 2026-05-26  
License: CC BY 4.0 with a link back

CVE-2026-27398 · Severity: medium · CVSS 5.3 · Published 2026-05-25

The RSVP and Event Management plugin for WordPress, used to manage event registrations and attendee lists, contains a security flaw in its access control settings. This vulnerability allows unauthorized individuals to perform actions or access features that should be restricted to administrators. While the impact is considered low, it could allow attackers to interfere with event management data without needing a password.

Technologies: [WP Chill RSVP and Event Management](https://junglewise.ai/threats/technologies/rsvp-and-event-management). Vendors: [WP Chill](https://junglewise.ai/threats/vendors/wp-chill).

## Quick answers

**Is CVE-2026-27398 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-27398 being exploited in the wild.

**How severe is CVE-2026-27398?** Medium severity, with a CVSS score of 5.3, published 25 May 2026.

**Which products and versions are affected?** WP Chill RSVP and Event Management <= 2.7.16.

**Is there a fix for CVE-2026-27398?** A patch was published on 2026-05-25: Fixed in version 2.7.17 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-27398 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-27398?** Check whether you run WP Chill RSVP and Event Management 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

A Missing Authorization (CWE-862) vulnerability exists in the WP Chill RSVP and Event Management plugin for WordPress through version 2.7.16. The flaw stems from a failure to implement proper authorization or nonce checks on certain functions, allowing unauthenticated remote attackers to execute actions that should require higher privileges. The attack vector is network-based with low complexity and requires no user interaction. An attacker can exploit this to modify data or settings, though the CVSS assessment indicates no impact on confidentiality or availability. The issue is resolved in version 2.7.17.

## Affected products

- WP Chill RSVP and Event Management <= 2.7.16

## Timeline

- 2025-11-11: other: Reported by researcher daroo
- 2026-05-25: advisory: Published by Patchstack and NVD
- 2026-05-25: patched: Fixed in version 2.7.17

## References

- [https://patchstack.com/database/wordpress/plugin/rsvp/vulnerability/wordpress-rsvp-and-event-management-plugin-2-7-16-broken-access-control-vulnerability?_s_id=cve](https://patchstack.com/database/wordpress/plugin/rsvp/vulnerability/wordpress-rsvp-and-event-management-plugin-2-7-16-broken-access-control-vulnerability?_s_id=cve)

## Related threats

- [WP Chill RSVP and Event Management stored XSS](https://junglewise.ai/threats/cve-2026-121570-improper-neutralization-of-input-during-web-page-generation)
- [WP Chill RSVP and Event Management sensitive data exposure](https://junglewise.ai/threats/cve-2026-39536-wp-chill-rsvp-and-event-management-sensitive-data-exposure)