CVE-2026-27398Network attack vector

Unauthenticated restricted action execution

Published May 25, 2026 · Updated May 25, 2026

Missing authorization in WP Chill RSVP and Event Management 2.7.16 and earlier allows remote attackers to invoke a restricted action. Patchstack and the upstream security changelog do not disclose the affected endpoint, action, or omitted authorization check. Network access is sufficient without authentication or user interaction; the published assessment reports limited integrity impact only.

CVSS severity5.3
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in WP Chill RSVP and Event Management 2.7.16 and earlier allows remote attackers to invoke a restricted action. Patchstack and the upstream security changelog do not disclose the affected endpoint, action, or omitted authorization check. Network access is sufficient without authentication or user interaction; the published assessment reports limited integrity impact only.

The record

CVE
CVE-2026-27398
Published
May 25, 2026
Updated
May 25, 2026
Vendor
WP Chill
Product
RSVP and Event Management
Classifications
CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 25, 2026CVE publishedPublication date reported by the CVE source.
  2. May 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a <=2.7.16 changes=[{"at":"2.7.17","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WP Chill · RSVP and Event Managementversion=n/a <=2.7.16 changes=[{"at":"2.7.17","status":"unaffected"}]

Published CVSS scores

5.3PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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